Its pretty much all speculation. The only things that one can say for sure are that he looks like he has the raw talent to be one of the best players in the world yet Fergie shipped him out for fuck all, Sam gave up on him, Harry didn't fancy him.

He might come good for some unknown reason. Maybe a spell abroad would do him the world of good.

But most likely is that he has just not got the mentality. Whether it is selfishness, stupidity, lack of application, lack of people skills - it doesn't matter WTF it is, it is clearly enough to mean that he is completely and utterly incapable of performing at a level even vaguely approaching that which his raw talent would suggest.

Don't let the door hit you on the arse mate.