It's true. He functions as a passenger player but doesn't do much more than that. He can play in our midfield and not look too out of place, but I don't see what he adds to our play other than effort (which is good though). I don't see that there's anything we rely on him to do or create in a game other than play correctly and not get in the way. As it has been said before, he'll be a good Keita-type player.
For him to develop into a "top class" midfielder he'd have to:
1) Have some sort of standout ability (distribution, vision, flair, intelligence, etc.)
2) Have the confidence bred by talent to grow as a player rather than please others.
Considering there are PLENTY of insanely talented midfielders who never grow to be what was expected of them, his chances of becoming that are to put it lightly, slim. He can develop some sort of useful function like he had with those forward runs on counters but we'll see as he goes on.