Because he's not suited for anywhere else on the pitch?
This. He doesn't have mental disiscipline and responsibility to play anywhere..But as it is , with his physical presence , decent passing, good powershot, drive to go forward, i figure he can do the least bad as holding mid. And it does require more concentration, but at the same time his fuckups cost less. But yeah its all potato tomato, if i could have any player in the world i would send him chopping wood.