Hehe yeah, Poor Vermalen noticed that in the CL games, when he was his CB partner.
And yeah, there was a time when I used to think Song was the definition of raw player, alot of physicality and defensive power who just charges in at will, but totally bumbling and error prone whenever he got near the ball. Last season he even showed he is a good passer who builds up play decently, and plays his role rather tactically, totally challenged.
Diaby is the reverse, showed quite bit of ability and potential initially, but has done nothing but regress as player since.