Gale's "bad" ending is actually the best ending in the game.

Who cares that he doesn't get character growth, he disappointed a cat and an old man, HE'S A GOD! Seriously, nothing else matters. So what if Ao is going to make him earn his spot on the pantheon? He's immortal, he has literally forever to do it. Sure professor Gale is fun and more chill, but he's still mortal. In six months Gale does what Vlaakith has been attempting for centuries. I don't know how you can be disappointed in someone for successfully becoming a god