I'd argue the foundations he had as a Monaco player are not really there in the same way. He's fundamentally a different player. I remember Monaco playing away at Arsenal and he tore them apart with his dynamism on the break. He had the look of a young, fresh, pacey and talented forward of the French school that usually produces good technique.
He's got different foundations now. Unfortunately they seem to extend from his feet to 5 foot into the pitch, holding him firmly in place. For me he looks heavier, less explosive, I'm wondering if injuries have hurt him in that department because I don't see that same dynamic ability and dribbling is rare compared to what it used to be. The only thing that looks better is back to goal, at least to my eyes. I think he has actually regressed, not just failed to improve.