Well, Alzur wasn't a saint either. Maybe Vilgefortz could be shown as a fallen hero. With Regis, who was "killed" by Vilgefortz, as the secondary character. Or the other way aroundIdk why do people think it'd be Vilgefortz. Vilge is a baddy so he can't have his journey lol.
Well he could but it's not logical when we have actual protagonists that could get their turn.