Milan needs to wait for Maldini to "solve" the problem. I don't mean Maldini's defense skill can solve the problem, in fact, Nesta, Stam, even Kaladze ( if he has a super-condition ) is super defender. But i find that Milan's defenders cannot pay attention to the game, and they cannot have a good teamwork. I think the most important problem is that Milan's defenders don't have a leader after Maldini retired.
If Maldini can play, all the defenders will become better and better.
But Milan should try to find a new defender in the defense as a leader. Kaladzer can't become the leader although he is the captian in his country. Cafu, Stam, Costarcurta will leave or retire after this season. Simic is a bench. Maybe we can get 2-3 new defenders, but they can't become the leader in thire 1st season. So the only choice is Nesta, when he played in Lazio, he was the captain.
Milan only has European Champion Cup can win, our defenders can't make any mistakes, at this time, we need Maldini, need our great captian to lead the defenders have good teamwork and come back the "Milan Spirit".