Then behind the ST? I can't see Wenger playing him there unless he decides to just hoof the ball up to Fellaini and exploit his aerial and physical ability. The latter is the main reason why he has excelled in that role. Otherwise, he doesn't fit Wenger's bill in terms of the technical, quick, crafty kind of player. If anything, he's probably buying Fellaini to play him as a DM, where Arsenal needs a bit of an enforcer in there.