Carlos Tevez left United because he was better than all the players at the club and wanted a new challenge ?

I think it was to do with how much game time he got, and how he wanted to join a club with a working class atmosphere who would welcome him and make him the centre of their plans (similar fans to West Ham). And he obviously hates Bacon Face so to piss him off joined 'liddul ciddy' and said a few things about him to the press :)