What if he doesn't have a banana at the time?
In any case I think your looking at the player is just as speculative as focusing on the character. As DMG pointed out earlier on we'll never know what M2K could've done with another character like DDD. Nor do we know (or will ever know for that matter) whether a bunch of other characters have hidden potential.
It feels like the case you are making here is that because we do not know the above, we cannot decide based on what we do know, from theorycrafting and data. It kinda feels like you're demanding a kind of certainty, or complete picture that we will never have in order to warrant any kind of action. In other words you're using the lack of one fact to claim that another fact isn't a fact as if though they were not seperate facts to begin with.
I mean if banning MK could've lead to the sun exploding and destroying humanity then I'd understand where youre coming from. But as it is, the worst that can happen is that it turns out MK was not broken, that the community suffers too much from the controversy of the issue, or both. In either case it will be a valuable experience.
It also seems to me like you resort to writing a lot of stuff that doesn't really hold up to a closer analysis just for the sake of argument, for example a crazy offensive zero suit wrecking some balls at a tourney doesn't really say much.
