I would start Mellberg instead of Legro. Mellberg has been performing great each time he's giving the chance. I wouldn't mind Mellberg-Legro or Mellberg-Chiellini, but Mellberg needs to start.
Legro and Chiellini are first choice. Mellberg's been doing fine when given the chance but he is still backup. Legro had a stinker against inter but other than that he's been immense. You can tinker with a lot of things in a football team but imo the CB pairing should remain the same as much as possible.
We should try that lineup in Coppa Italia or some worthless match. With that line up you get rid of the weakest players on our team Molinaro and Gygrera.