The idea that playing alongside Busquets in midfield provides us with more defensive security is seriously flawed. Barca's defensive security is provided by fluidity in possesion of the ball. If our midfield/attack is disjointed then we lose the ball and are susceptible to counter attacks. Song is completely useless to us, he's average defensively, average on the ball and he doesn't even provide the midfield with an alternative in terms of directness or pace. He might have looked good at Arsenal but he's a serious step down in quality for Barca's midfield. It's not his fault though. A serious f*ck up by Zubi is what it is.