Guess it kinda makes sense when you think about the left-backs we've been linked to in the last couple of seasons - Heinze, Kaladze, Chiellini, etc. They're all more defensive left-backs/auxiliary centre-backs. Can't remember who posted on here AAAGES ago, but there was the theory that Rafa wanted a defence wherein the left-back could tuck in and almost form a 3 at the back, with a far more attacking right-back on the other side. The story was that he'd tried to train Riise to play this role, but naturally it wasn't a great fit. Makes sense though, both in terms of our previous LB targets (could we throw the lad from Bilbao among them too?), and our previous linkage with the likes of Alves and Rafinha.