Playing Chiellini anywhere other than CB is a waste of his immense talent. Any team which did this with a four man defense would have to have two other world class CBs (Which neither team that Chiellini plays for does) for it not to be such a waste.
If Zambrotta performs as he did for Milan this season, then it wont take long before we see Criscito. I suppose the same could be said about Cannavaro though.
I predict the back 4 to be maggio and criscito as the full backs with chiellini joined by one of bonucci or bocchetti in the centre...3rd game this will happen.