Poor him, I believe he has made the wrong decision to move to Man United so soon.
He was one of the brightest teenagers at that time, proper care needed to make him grow, 60 million (add on) big money move to EPL under the whole world spotlight wasn't make him any good.
Besides, he was never under a good coaches who can protect him well, most of the coaches after SAF need instant result rather than spend few seasons to bring him up.
He is almost the same player he is 6 years ago when he first reach England.
You see now why some good young players refuse EPL move prefer spend their teenage at lower league. It make sense.
Yup, He has to go, moving away from EPL, change the league and try his luck again.