It's also plausible that he's the kind of player who can only flourish in a Pep-type system. England's midfield lacks the control and fluidity seen at City and is always likely to as it takes a group of players who train together day in, day out to play that way usually. Without a midfield capable of dominating possession and progressing the ball as effectively, he can't do the quick combinations, off-ball movement etc that he is good at, and it may be he is not good enough to adapt to play any other way. A one trick pony if you will.