Kit Harington himself spent a while hoping that Jon would be resurrected as a darker version of himself, and he has admitted initial disappointment that Jon Snow 2.0 wasn’t a villain.
Still, there were noticeable changes in Jon, even if they weren’t the result of death turning him into a bad guy.
Jon went on a journey that took him from corpse to general to king, and it was a journey that earned Harington the Emmy nom.
Even those who didn’t buy his goodbye might not have known just how Jon would come back.