User blog comment:KillRoy231/My review of the Deadly Six/@comment-477304-20131021001503/@comment-26973802-20131022001754

That's just for the sake of the player being able to fight him again. Sonic can re-enter both Eggman battles after he is "taken" by Time Eater as well, can't he? Although what he says does make it seem like any rematches are canon