I think a few things have changed
- He is better at pressing, stealing a ball (his acceleration catches players who sit on the ball), I don't recall that being part of his game
- His passing has improved, awareness of where (usually Son) other players are
- To above point, he doesn't hold on to the ball as much as he used to (just the act of sometimes releasing the ball quickly vs. always running with it makes him less predictable, more effective).
To me the choice of playing him is simple
- In cups and against lower level opposition, his directness is devastating, it just works
- He has to either play in middle or be allowed to drift inside, if we want someone to play out wide, he tends to be less effective there (out of game)