He's absolute class, a real warrior, but we don't need him. Kind of like a Zaba but at CB, always wanting to put in a tackle or get in a fight and he more than makes up for his lack of height with his aggression in the air. But we simply don't need him. He can only really play as a left sided CB and we are already stacked with fantastic CB's(at least I think he can only play on the left as I've never seen him on the right and Garay moved over to the right to facilitate him in the Argentina team. That to me suggests Otamendi can't play there, as Garay playing on the left is pretty much the bedrock of their defence usually). In Kompany and Demichelis we have more than enough experience and in Mangala and Denayer we have two of the best young CB's in world football, who I would n't be at all surprised if they went on to become one of the great partnerships, as their games are suited well to each others. The only way I could see us wanting Otamendi is if Kompany was leaving, and that isn't happening.
He's going to cost someone a fortune and they probably won't regret it, but CB is just about the last position we need to be spending big money on.