IDK! His 'biting Sam to death' comment sounded like serious overkill, it made no sense - he'd just killed that guy, he wouldn't have that urge. The whole evil demon posturing towards Sam is not convincing me. So like Dean with his self worth issues and endlessly testing Sam to find out if this time he'd leave Dean - I am not convinced. I mean - sure, he's something - but not the way he's claiming to be, IMO. Maybe I'm wrong .