I like that idea, it kind of reminds me of the Super Star Wars games for the SNES. It would help keeping gameplay fresh and slightly less repetitive, in a sense. But I'm not sure if that's fitting for a Sonic game such as this, a game which pretty much everyone has agreed we don't want more than 3, maybe 4 characters in. I think the concept works slightly better in a Fighting game where you have more characters, Or at least an Action game like X-men 2: In Clone Wars or Marvel Super Heroes in War of the Gems. Not to say it wouldn't fit at all, it just wouldn't fit in naturally. In other words, I think it's worth considering, and should neither dismissed as stupid or ridiculous nor be accepted with singular avidness or respect. All in all though, while I like the idea, I don't think it quite matches up with the style of the rest of the game. So even though I like the idea I would vote against using it, unless there is some kind of general consent by all (or at least most) members that we could use a gimmick like that in the gameplay.