FYI, it's usually the same people doing the Cometeor thing every time, they just swap GCs. For the most part, it's because Storm seems to be stacked with tanks and melee, so you can't really even do that even if you wanted to. We have done it a bunch of times, but usually only with a premade where more people decide to go caster. We are able to win without the casters though when people listen which is nice.