the hero of kvatch

just thought of something people keep saying that the hero of kvatch is the most powerful but if you think about it the hero of kvatch when he becomes sheogorath is he still hero of kvatch or is he now sheogorath or sheogorath now the hero of kvatch just like is sheogorath sane or insane or is he insane but sane is he mad or completely sane or sane but completely mad