I'd hazard a guess that it's cos an enhanced physical stature has completely fuck all to do with being a decent defensive midfielder.
He's fairly disciplined though and covers alot of ground, I don't think it's unfair to suggest the raw attributes are there, coupled with him bulking up a bit, in that sense it's exactly what we're missing in the engine room, someone who's both athletic and has a good physique, if he can channel some aggression into that we could have some player on our hands because technically he's also very good.