To be fair, we don't know much concerning specific things in the campaign like this. About the only thing we can be mostly sure of is that the opening and closing cinematic will be actual cinematics (3rd person).
Hell, we don't even know what the structure of the campaign, like how missions progress and such. For some reason, I'm picturing Megaman Zero (unlock a set of small missions, then get a major one, then another set, etc), but that's probably wrong.
Surely there's no problem with them putting me in Brawl, right? It's ****ing satire, damnit. My quote rocks your socks.