Murray doesn't have the required deep belief in himself, and that's the main difference, the rest is peanuts, and what he has over Djokovic is actually irrelevant as long as this main difference is in place. It's like someone scared him to death when he was a kid.
I like Andy a lot and still can see him winning GS, preferably Wimbledon
people often manage to fight their demons if they try really hard and don't give up. The things that would make Andy happy have to do with mind and soul only. Did I hear he hired a psychologist? Smart move if he did. Novak did.
Some players, like Nadal, and I would even say Federer, they don't think that much, they have it in their blood and are not entirely conscious when they play. It has been the story with many top athletes. Roddick too has it, but in his case to his disadvantage
IMO his game is just plain mindless
On the other hand, guys like Novak and Andy, who think a lot
when they play, must have a proper psychological construction supporting them, they must make conscious efforts to streamline thoughts. Their advantage should be that they can change their game more freely.