He revamped several concepts making the old feel new exactly what The New 52's goal has been the whole time. Yet he leaves. After so many writers and artists just leaving it seems obvious to blame DC again.
I am starting to think it is Terry Sloan. It is because they fought before and the fact that Sloan was suppose to be the ultimate alpha male yet he shared a world with Bruce Wayne and lost a fight it must have gotten under his skin. Continuing the comic book tradition of villains dressing as heroes he becomes Batman.