Wait, but aren't "limits" constantly mentioned in other shows/universes? Take DBZ for example. I believe during the Green people planet (The piccolo kind.), one of the characters mention: "This is it, he's at his limit." This obviously means that he's as powerful as he can become so far. You max level I guess. Limits seem to be more of an "universal" thing in universes. They're constantly mentioned in anime too. I think.