It seems like from the time it was apparent Silva wasn't an option, Tito has been targetings a guy who could fill in at CDM and CB, was a very good passer, and physically strong. The main objective was Javi Martinez, which would've been great, but Athletic put a rediculous price tag on him, so that was a no go. So they moved to Song. IMO, it's a bit of a reach, but Song is alot more talented than Keita, but with half the brain and less pace. It's either gonna end up being a terrible signing or a great one. He's just a squad player though, so the expectations shouldn't be too high. What I do know is that to have wanted this move, he must have known he was coming in to play a role, so I have to believe that he's going to put in the time to learn his role and perform his duties.