I also think clubs have worked him out. He got away with his risks for a bit, but quite quickly people got wise to him a it was not unexpected. I'm not sure he has ever really developed from that point.
It surprises me why people have looked at him as a 6. I don't really see that. To me hes probaby best as more of a box to box player, who makes some tackles and tries to get on the end of things. If I was coaching him, I'd have been working on his shooting/finishing. He often gets into good positions, but doesn't finish well enough. But if he added 6 or 7 goals to his game, he would probably be a first team starter.