then, as has been mentioned, do what everyone did to wynaut and ban politeod, not just his ability. Fits under support clause, solves all the problems with the least bans.
It does, but there's one major drawback.
As I said, T-tar and Hippo would then be fair game to be banned too, because of Dory and Randorosu. And Ninetales, I suppose, if people are scared of Venasaur that much.
Regardless, the problem is that you lose at least a 1 playstyle (the stall version of that weather) when you do that. No rain stall without Poli, no sand stall without T-tar/Hippo. And I can't see the somewhat simpler ban justifying losing an entire playstyle per banned pokemon.
Edit:
Why ban 2 pokes when you only have to ban 1?, thats not fair game, its ridiculous.
Because either could be used to setup the potentially broken Dory, since they both have Sand Stream.
Edit2:
Oh, unless you mean inducers versus Dory. In that case, you have Randorosu as well, and more importantly, there's that double standard again. We can't just switch to an alternate banning system because rain might require a bit more testing than sand.