I wouldn't drop Csricito so fast.. He is our second best CB of the group.
During the matches from the preseason till now, he very close to Adnrade's performance if not as good. He played on weak 45 min half.
We need a group at the back the know each other. The ideal would be Zebina, Andrade, Criscito and Chiellini. If Zebina is not playing then we put someone there. We shouldn't change another player. Our defence is not that good, and maybe its best bet is to play the same formation at the back so they know each other. Criscito and Andrade are getting along well. Lets not break it. Every hill climb has a set back, lets hope the Cagliari's game was theirs.
As an RB, well Nocerino would be my primary choice. Birindelli is totally out of form.
We could also player 3-5-2. Something like this
--------------------------- Buffon
-------------- Andrade -- Criscito -- Legro
Camoranesi ----- Almiron ---- Zanetti -- Chiellini
------------------------- Nedved
------------- Trezeguet ----- Del Piero
This is a very flexable formation that shifts from 3-5-2 while we are attacking to 5-3-2 while deffending. Nocerino could play in Almiron's role to give more deffence stability.