Some level of douchebaggery often goes hand in hand with real creative talent. Not to say that you have to be a dick to be creative, but they do tend to coincide often.
It doesn't make it easy to work with these people, and you often get a situation like Fez where the game takes 2 or 3 times longer to finish than it should have. But hey, the result is nice. I don't care how the sausage is made. If he is changing his mind now, maybe he's seen the light. I will forgive him if he sees the error of his ways