I never claimed this was a democracy, but if informed discussion weren't relevant to the rankings, this thread wouldn't exist, so don't come at me with your shallow, pretentious put-downs. I haven't made the same argument over and over, either: I've brought up different points depending on what people don't seem to be considering. And I have just a much a right as you or anyone else to voice my opinions, and I won't tolerate being talked down to like I know nothing, so you can go ahead and leave out the belligerent insults in your next reply.
No rudeness was intended. Sorry.
Now, for your actual arguments... People always seem to come back to assuming I'm trying to say that Infernape is this amazing mon that has 12 moveslots and can run every move I mention at once, and I don't know where that's coming from at this point. I'm not claiming it's this god of OU that should be A rank or anything of the sort. I don't even always use infernape myself or anything, as often there ARE better options for what I need on any given team. But again, that doesn't make it any less relevant, it just means that like any other pokemon, it has pros and cons and must be carefully considered before getting a teamslot. I've gone over this before, but here we go again I guess. Infernape is admittedly frail, so it has few chances to switch in, and it can be pressured against highly offensive teams as 108 is a good speed tier, but there are plenty of faster threats that can OHKO him (gengar, lati@s, greninja, talonflame, etc.), so i don't think he should rise a LOT, but he certainly shouldn't fall, and I'll explain why (again).
As for comparing 'nape to terrakion, that's one I hear a lot, and in a lot of ways terrakion is better: it has the same speed tier, fighting STAB w/CC, better bulk and a higher Atk stat, plus a lot of the same moves (taunt, CC, EQ, SR), but does that leave infernape outclassed? Not by a long shot. Heck, I'd say that if we're only comparing 'nape with Terrakion, 'nape is gonna come out on top in a lot of important categories. First let's go over their lead sets. Both have the same speed tier, and will run a lot of the same moves, usually something along the lines of taunt, SR, and 2 coverage moves. So, let's examine that. Most lead terrakions are going to run some combination of Taunt/SR/EQ/stone edge/CC as their lead set, which will let it hit a lot of threats. So what will Infernape run? On a lead, I usually run some combination of taunt/SR/fake out/fire blast/CC, with CC being potentially used over SR or taunt depending on the needs of my team (just so this doesn't come back to thinking I'm trying to run five moves again). So where does this leave that comparison? Let's look, shall we?
-Terrakion's lead set is able to taunt to prevent rocks/other hazards from slower pokes. Infernape does EXACTLY the same thing.
-Terrakion's lead is able to set SR. Again, 'nape does the same.
-Terrakion can hit pretty hard with good coverage in the form of EQ/Stone Edge/CC. And would you lo and behold, Infernape gets all those moves plus a bunch more. Now, in this category, Terrakion has a slight edge, as it has a higher Atk stat, but for the most part, what terrakion kills with SE hits, 'nape will kill with SE hits. That only gives terrakion the edge against neutral targets, basically. And that's still only counting the physical side. Nape also has a ridiculous special movepool it can use very well.
-Terrakion won't die immediately against talonflame. It's got 'nape there. (In fact, there are a lot of leads that terrakion won't immediately die to that 'nape will, such as lando, rotom-w, and garchomp, but terrakion won't be BEATING any of those either, so it's mostly a tie in that regard.)
So if we're just comparing lead sets, nape hits a smaller coverage window with only fake out/fire blast/CC as it's attack options... but what it hits better with that combo is VERY relevant. With fake out/fire blast, Infernape completely shuts down sashed leads such as breloom and mamoswine before they can do anything. All they're going to be able to pull off is a hit from their priority moves after 'nape breaks their sash with fake out and OHKO's them with fire blast. That means no SR from mamo, and no Spore from breloom. This is something terrakion could never hope to do. So what else is infernape beating with it's lead set that terrakion would have no chance against? Oh, nothing really important... just the A rank threat MEGA FREAKING MEDICHAM! That's right: with this set, Infernape is a 100% check to mega medi, and will beat it one on one every time, assuming fire blast doesn't miss. (and if you wanna go there, 'nape could just run a completely physical set with fire punch and still get the same result without the accuracy concern) 'Nape has a faster fake out, which is what most people use to get medicham to mega evolve, and after fake out damage can easily finish it off with fire blast, with the only thing medi could do is minor chip damage from a resisted bullet punch (i feel like i'm repeating myself... huh. it's almost like i've said this before and it completely holds up). Oh, and before I forget: Infernape OHKO's ferrothorn, while Terrakion doesn't, and Terrakion takes a sizable chunk of damage from power whip/gyro ball. You already mentioned skarmory a little, but I also have to mention that it somewhat falls into the same category with mamo and breloom as a sturdy user, since infernape can break sturdy w/fake out and then OHKO with fire blast. The only caveat there is leftovers sets, which will heal off the fake out damage and still survive the incoming fire blast w/sturdy. But if you consider that there's literally NOTHING terrakion can beat skarmory with (and the fact that most skarmory anymore run shed shell to escape mag), i think we can still call that one in 'nape's favor. Now with all that said, what does terrakion have over infernape? Bulk. Terrakion has a better chance against pokemon that both it and infernape both take neutral damage from, as terrakion's bulk will allow it to survive a lot of hits that would KO infernape. So if you only need a vague lead and aren't worried about any of the threats I mentioned, terrakion's your mon. But if you want a lead that can break opposing sash leads and beat mega medi one on one, you're gonna prefer infernape
As an anti lead, there's no denying Infernape is a fantastic option. There's the problem. You are over-selling anti-leads. They are not the most helpful things ever. Sure, pressurising other leads is great and all, but I find anti-leads to be lackluster as they don't seem to do much else than, well, anti-lead. Sure, checking what it checks is quite nice, but the fall in viability in what it checks/anti-leads is one of the main reasons why Infernape is less viable now. Skarm and Ferro are just two things Infernape happens to check, but the only problem is they've become a lot less popular recently, for obvious reasons. It also can't be just me, but leads seem less viable nowadays, with the exception of Terrakion and Chomp. Lead Mamo and Breloom just don't hold up with the current metagame and seeing as these are the two that Infernape wipes with, it seems that what Infernape checks going down in viability is a common thing nowadays, putting logic behind the Infernape dropped.
So, there's the comparison on lead sets. Doesn't look like infernape got completely outclassed to me. In fact, it looked a lot more like infernape was a better choice against a multitude of common leads. Huh. Go figure. Now let's move on to the next thing you mentioned, the straight-up life orb attacking sets. A typical terrakion LO set is going to run some combination of EQ/Stone Edge/CC/SD/HP ice. And that's pretty much it. Sure, the odd one might throw on quick attack, iron head, or poison jab, but you really shouldn't bring those up, since infernape has stronger versions of all of them in mach punch, iron tail, and gunk shot, so they don't really play into the comparison, except to give infernape the edge on coverage (and in those moves' cases, power). Speaking of which. what about LO infernape? Well, Infernape has a multitude of options. First off: boosting. Sure, terrakion has SD for it's set, but 'nape can carry SD or NP, and abuse both easily with it's huge movepool. In fact, infernape has STAB priority on both sides of the spectrum, so after a SD/NP boost, it becomes VERY threatening, even to offensive 'mons that would usually outspeed and KO (looking at you, greninja). But let's just stick to some of the main things infernape has over terrakion: first, a special movepool and the SpA to make use of it. This allows 'nape to run mixed sets that utilize powerful moves like overheat and then continue attacking from the physical side with no power drop-off. Next, STAB priority: infernape gets mach punch and vacuum wave, giving it a leg up on terrakion's quick attack, doing almost twice as much damage to neutral targets, and obviously MUCH more to fighting-weak targets. Next, infernape gets MUCH more coverage, with moves like grass knot and thunderpunch adding on to the coverage it already shares with terrakion in moves like EQ, stone edge, and poison jab. So basically, LO infernape dwarfs terrakion's coverage, and therefore can out-damage terrakion against a lot of pokemon, especially water types with whom they share a weakness. Again, we end up in the same place as with the lead sets: Infernape has the versatility to cover more threats, but terrakion has more base power, so if all you want is to do higher damage to neutral targets, terrakion is likely the better choice, but if you want to hit specific pokemon for SE damage, you'll probably want to run infernape and give him the appropriate coverage.
Again, the things that Infernape beats that Terrakion cannot seem rather irrelevant. I'll agree Infernape has better priority, but it's not like what Infernape can handle isn't hard for offence to handle anyway, and offence is what team you'll see Infernape/Terrakion on. At this very moment a core of Terrakion and Greninja seems far better than running Infernape on your team: Sub SD Terrak (WHY didin't you list sub as an option, and why did you put EQ) + Greninja is an offensive core that fucks with offence and stall, except what's checked by the core is far more relevant then what Infernape checks on it's own. Since this is a viability thread, if a Pokemon has almost nothing over an easy to build around core, it's viability decreases as it's almost pointless to slap onto a team when you could be running something far better, even if it does mean that's 2 mons. It's not like using a core like that has a lot of opportunity cost, is it?
Now, I don't have time to list every single threat that LO infernape or terrakion will beat or lose to here, so I'll just ask that people use good logic to understand what I'm trying to get across here. I'm not saying that LO infernape is going to beat, say... landorus or slowbro or something, as well I shouldn't because it won't (and neither will terrakion). So if something is obvious (like that) can we please assume that I DIDN'T mean that instead of that I'm implying that infernape can kill anything? It's moderate offenses mean there are plenty of things it doesn't beat; The main point here is that it beats almost all of the same things terrakion beats and then some with it's additional coverage options. I just have to be really aggressive with my explanations since the assumption most people make is that infernape is bad.
But the problem is what Infernape does beat that Terrakion doesn't is either irrelevant, falling in viability (Skarm, Ferro, Breloom) or easy for offence to handle with better mons. Infernape isn't just outclassed by Terrakion alone, it just struggles to find a place on offence as most combinations do far better than Infernape could on the team. C suggests that Infernape can fit onto a select few teams, which it can. But that number is very small.
So what's the conclusion here? Basically, that terrakion outclasses infernape... against neutral targets. By virtue of it's higher attack and bulk, terrakion will fare better against pokemon that neither it nor infernape can hit super-effectively. But as infernape has a larger movepool than terrakion, and is thus capable of hitting a ton more pokemon for SE damage, that's actually a pretty short list. And considering that we didn't even get into infernape's ability to use U-Turn to run from trouble, or will-o-wisp to cripple it's counters, I think it's safe to say that infernape is in fact NOT outclassed by Terrakion in every way as you claim, and in fact, it is Infernape that out-does terrakion at many important jobs.
It doesn't out-do Terrakion at all, it's much harder to fit onto teams and deals with a lot of random shit that a better offensive core could anyway. It's partially outclassed in the sense that it does have niches over Terrakion but they aren't all that massive (I guess priority STAB is a biggie though) in the long run.