Can will boost us more playing at RCB, than at CM. I'll take Yaya Toure coming down the centre, pushing Allen out of the way and trying his luck from long range - if he scores with a great strike like the Besiktas guy did, then fair play to him. However, Nasri / Silva weaving their way in and out of the box via one flank or the other, or exploiting gaps between the flank CBs and Skrtel is a much bigger problem for us. Let them get into the box and they're going to put the ball into the net or set up Aguero. So, I'll take having a stronger back three over a weaker midfield. Even Can in midfield is no guarantee that we'll actually be strong enough there, which then gives us doubts in two areas.