There are couple of reasons but main one is his decision making. I hope it improves but he's no spring chicken anymore, plenty of experience playing at men's level already. He has flashes of brilliance but so far not often enough for someone playing that position. He's also not particularly quick, if not particularly slow either. He's tenacious, can pick a pass when he spots it and has a good shot on him. Decent skill but hardly a magician like Ndiaye.

Now, I might well be talking out my arse and he picks up from here. Maybe getting couple of better players around him will unlock his abilities, I don't know. Hope so.