I think he has a creative intelligence and decent technique but it's not really coming together in a working package on the pitch.
Lack of consistent minutes is a factor of course but imo there is something about his physical constitution that keeps him a step behind the game. The sort of laborious, feet-dragging movement. You see his head drop when he has to move 20 meters. You can see he has some speed over distance but takes a lot of effort to get moving.
Dropping to the floor when under pressure might work once or twice in a game but not a serious way to play in the long term.