Please, learn to fucking read. I've said many, many times that we cannot ban Dark Pulse or Nasty Plot or whatever on Darkrai, because OTHER POKEMON USE THOSE MOVES WITHOUT BEING BROKEN. This DOES NOT apply to Dark Void - Darkrai is the only pokemon who uses the move, and he's broken with it. Ergo it's possible to simply ban the move, which cannot be done with any other move unless all pokemon who use it are broken (this could be an argument for banning Judgement or something, but there wouldn't be much point since Arceus would still almost certainly be Uber, whereas Dark Void being banned could realistically stop Darkrai being broken). So no we won't have to deal with this for every Uber pokemon, since very few are made uber purely on the basis of their signature moves, which are the only moves that could be banned in this way.
Wow. So instead of countering my points (or even reading them, it seems), you question my motives? I'm going to ignore your bullshit claims about my motives because they're entirely irrelevant to the argument. Now, let's dispell some of the other lies you're spouting:
I have at no point ever expressed the opinion that Darkrai can be the only pokemon to have a move banned instead of it. If somebody made a decent argument for Ho-Oh being OU without Sacred Fire, then it too would deserve a test. Ditto for any other Ubers or Suspects whose signature moves are pushing them over the edge. It just happens that the most relavent example of this currently is Darkrai.
I never 'held claims' on anything regarding Doubles Sleep Clause; I said that DV would probably be banned in Doubles under Sleep Clause; I did not claim to know this for sure, and in any case if Smogon does develop its own Doubles metagame independant of the VGC, then it should not be using the singles ruleset, but rather its own independant one, so this debate won't affect anything in a properly-built Doubles metagame.
I am not 'completely oblivious' to Darkrai's other qualities; I have said on numerous occaisons that Darkrai may well still be Uber without Dark Void. However, I, unlike you, am supporting a test of this theory, rather than acting on pure theorymon. The fact that Darkrai's best set (Nasty Plot) relies heavily on Dark Void to set up, and the fact that almost every Darkrai set utilises Dark Void is enough to show that removing Darkrai would make a big difference to Darkrai's power, which may or may not be enough to render him OU-worthy. The only way to find this out is to test it.
Also, you seem to be unaware of how arguments work. If somebody asks question X and I respond with response Y, then if you believe that response Y is weak (or 'doesn't cut it' as you put it), then you respond with response Z. You do not go back to question X. That will just give you response Y again.
I find it rather amusing that you insult my 'argumentative skills' when it seems you haven't been able to master the most basic of all of them; reading. Besides the Doubles argument (and the irrelevant claims as to my 'bias'), everything you said here I've countered before, many times. If you think my counters are weak, then counter them yourself. Don't just ask the same questions again.
I'm not sure about this, but I think your argument is that things will get screwed up if another Dark Void user comes up at some point, yes? Well in that situation we would of course simply have to revise the ban, and if any user of the move was found to be not broken with it, then it could not be banned, and the other users would have to be banned outright if they were broken with it.
On the slippery slope, the only door it opens is to banning other signature moves, since almost all other moves will have at least one non-broken user. For most Ubers, their signature moves (if they have them) aren't the reason they're broken. However, if an argument was made for Ho-Oh sans Sacred Fire or similar, then I'd be open to a suspect test. What this system does prevent is the shitstorm created by things like 'Rayquaza minus X-Speed, Outrage, DD, SD, DM, EQ, FB, etc. could be OU!'.
Finally, I sincerely doubt this movepool situation is temporary; GF very rarely distributes legendary signature moves to other pokemon (the exception being the Dragon trio's signatures on event Arceus and Darkrai). However, if another pokemon was to learn DV, then we would simply revise the ban as I described earlier.
As I said to UltiMario, I'm not restricting anything in Doubles since Doubles should be using a different ruleset to OU. Also, of course Darkrai is the problem, but that's because, as I've said on numerous occasions, a move is only as good as its users. Dark Void is in the movepool of a pokemon designed to abuse it, making it more dangerous than Spore. You can't only look at the numerical stats of a move when deciding its brokenness; you must look at which pokemon get the move. Also, you claim that I'm making claims on a 'purely hypothetical basis', when in fact it is you who is guilty of this. I am calling for a test to find out whether or not my hypothesis is correct, while you are dismissing said test based on hypothetical knowledge.
Sorry, your post is way too long and my laptop's running out of battery, but I will say this: yes, we could test Ho-Oh sans Sacred Fire or Mewtwo sans Psycho Break in OU, but it's unlikely they'd be found OU, thus they'd be sent back to Ubers. However, if somebody made a very good argument that they'd be OU, a test could be conducted. Water Spout however could not be banned, as no matter how little the pokemon are used, if there are pokemon who use the move to good effect, then the move cannot be banned. I believe Octillery learns it and he can be used to good effect on TR or BP teams (assuming Inconsistent is banned of course, since currently that's his top use).
Regarding abilities, we already are allowing outright ability bans such as Drizzle. In fact, there's a poll on that very thing right now in PR.
Also, on your last point, if you can't see why effectively removing one move from one pokemon's movepool is 'less of a ban' than remocing a whole pokemon, then I'm not going to explain it to you.
I may counter your other points later, but I don't have time atm.