He is useful because he is such a handful to defenders. Seems to make more ground than other wingers. He didn't do anything wrong did he? All I saw was a raw athlete running hard and finishing off one good chance he got.
Two or three half-chances, that he simply didn't have the pace to exploit (Mellor outpaced him for the first one, IIRC). He's had a run of 8 straight games now, 10 in total, he should be showing more signs of improvement, IMO.
I think he could be an excellent centre, I just don't think he's enough of a threat on the wing.