You talking about the post where everyone started to realize the Kage's didn't have items on them and that the screens of them were their Story Mode battle?
I wouldn't worry. Even if we only saw them as bosses, the fact that CC2 gave them all movesets and Free Battle like fights means they're most likely playable. It'd make no sense to leave them in story mode only. --- It's as though I know every combo in the video game but they keep pressing the A button!