Buffon, are you kidding? He was in the hospital ward for so long and never got his form back. Chiellini was ok, but the negativity got to him and started doing way too much and forgot about defending at times. As for Del Piero, he did nothing but lose the ball, and "run" with laughable pace, just like against Bari. It's going to be a long season for the old bastard.
Are you sure you don't rate Sissoko highly as well? They both lose about the same amount of balls, maybe that's a metric you are fond of.
Actually, if I remember correctly, the 4 2 3 1 formation was working wonders until Del Piero came back from injury, and the old bastard just had to play. That's when our form began to go but I'm sure people were happy to see him on the pitch, just like yesterday.