User blog comment:FTWinchester/Season 9 Recurring Characters/@comment-3481504-20130718163128/@comment-6637171-20130721091844

I always thought that in the end Gabriel lost his love for humans. He said to Kali "Screw this marble, let's go check out Pandora". You know, implying that he was done with us.

Just my theory, that if he's revived, he'd be the strongest celestial and it may go to his head and he may turn against the Winchesters.