OK, I have no problem talking facts. And the fact is, if you try to switch in Zangoose defensively, you'll probably lose a mon. At the very least, even if you don't lose anything, you need multiple mons in good health just to deal with it. It is also true that SD Zangoose murders stall given perfect prediction. If you try to say anything to this, you're just lying, or distorting the truth.
But may I point out, this argument leaves a single, incredibly controversial step left unproven--yet somehow not challenged in this thread. Does the three-facet combo of (Fast + Able to Change Moves + Impossible to switch into without losing something big) necessarily mean "Ban"? If you have to rely on revenge killing and smart switching to deal with it, it is clearly broken? (Warning: some comparisons below may be a bit Farfetch'd.) Starmie may have something to say about that: it's impossible to switch into Starmie safely, lest you have some 'really obvious' switches. Even then, you get your hazards spun away, and Starmie escapes. How about MixMence? If MixMence switches in and Mence user predicts correctly: buh-bye, wall! And you know the deal, that leaves a hole in stall and it's hard to play further. I'm not done with their similarities. They have a single move that usually says: "ROFL GG WALL", and 2 or so coverage moves that destroys whatever the Numero Uno move doesn't. They are both prone to residual damage, and has a significant incentive to switch in and out often. Only a chosen few of the metagame outspeed them. They have no 100% counters, especially with Spikes, but both have quite some checks. There's some ways to deal with it with some sleazy switches. If Alomomola is at full health and say you have something else that can take a hit (let's say Amoonguss, but others work too) Switch to Alomomola -> Protect -> Amoonguss (or anything that can take a hit) -> Alomomola -> Protect kills Zangoose 100% of the time. It got worn down a lot, but doesn't that usually happen when you face most things that try to break stall with brute force? And to be fair, Alomo will be at around 60% when it switches back in. Not that much. If you have better prediction you can cut this loss down.
Also, for SD Zangoose, you lose a coverage. This gets you easily revenge-killed and virtually useless vs. offense, or you get hard walled by Rocks or Ghosts. From there, it's just Pokemon. We have a new ghost type and basically 4 really really viable ones right now. We have tons of Rock-types as we can see. You need a rock-type to deal with Swellow and set SR, anyways...
Phew, that was quite a rant. What I'm really frustrated about is that this thread is full of people who are like "can't switch in defensively with a single mon, must ban" when I know for a fact quite some people on the council are still thinking about this, including myself. Really, all I hope is that my fellow council members aren't stupid enough to just 'go along with the flow' and ban without much thought.