Ash pretty much said everything that I wanted to say about Terrak, so I don't need to say anything about that part of the post. Anyways, I really hope the bolded sentence is an ogre exaggeration. DeoSharp is basically everywhere at the moment. I honestly can't get away from it every time I go ladder. It's one of the most effective ways to go about building an offensive team simply because it pressures the fuck out of any Defogger in the tier, even Pokes that could potentially take on Bisharp. And yes, I'm not disagreeing that Sand Rush Drill hasn't shot up in usage, but I don't see how the rise in T-tar + Excadrill has anything to do with overshadowing another core that can't be compared in the slightest. DeoSharp is hazard control + offensive pressure, T-tar + Sand Rush Drill is just straight offensive pressure and support. That statement just couldn't be more flawed.
Nothing is dropping from S rank at this point in time, I'm just going to throw that out there right now. What you see in S rank are basically the Pokemon that run the metagame. Thundurus is an offensive glue mon that can be pretty much slapped onto any team that is even slightly offensive. Aegislash is aegislash, so nothing more to say on that. Deoxys-S is extremely versatile and the best revenge killer in OU. It can do pretty much anything it wants. Deo-D, as I've said many times, is a huge factor in offense being such a dominating force. I don't give a shit if all it does it set up hazards. It's the best hazard setter in OU, it helps create an extremely powerful core and pressures the fuck out of any team regardless of how many hazard removers you have. Nothing and I mean NOTHING can do its job better, nothing subjective about it. Mega Zard-X is versatile and is basically one of the most dangerous sweepers in the tier. It also fits great on stall teams with a bulky wisp set. Landorus is one of the biggest reasons why stall is struggling at the moment. Without CBB Nite or something gimmicky, defensive teams in general just straight up lose to Knock Off or CM Lando for the most part. On top of that, it pulls so much weight on offensive teams. It's just so powerful and defining.
Mega Scizor is a Pokemon that honestly I can't believe people sometimes consider dropping below A+. With the bulky SD spread that you see on the analysis, Mega Scizor sets up on so many fucking things it is absolutely disgusting. BP and Knock Off is all it needs after a boost or two to basically rip apart the OU tier with little effort. For example, it can set up on Adamant Air Balloon Excadrill, Aegislash, Lefties Thundurus, Azumarill can't really do shit to it unless CB Waterfall but it hardly ever stays in on it, Bisharp, Clefable, Garchomp lacking Fire Blast, Dragonite (they hardly ever carry Fire Punch), Ferrothorn, Landorus-T, Mega Venusaur, Latios, Chansey, and Deo-S (also another Poke that rarely runs HP Fire anymore). Those Pokes are ONLY ones that Mega Scizor can set up on, I didn't even bother listing Pokemon that it can check offensively. It's such a frustrating Pokemon to face, it can set up on a dime because of its massive bulk, and it has no problems tearing many teams to shreds. It's one of the reasons why some Pokemon are starting to run Fire-type moves, because being complete set up fodder can spell GG if you give it the chance to set up. In simplest terms, Mega Scizor is basically the epitome of what bulky sweepers wish to be.
tl;dr Deosharp is still everywhere despite surge in Sand Rush Excadrill, nothing is dropping from S, Mega Scizor will wreck your mum