Zacch changed to 5-3-2 (or 3-4-1-2) just before Felazio's last match equaliser.
He likes to use fullbacks as wingers but Juve doesn't have players good enough for that formation (or any other that relies on anything but teamwork).
Honestly, if he did decide to play with a 3 man defense with our current team, I'd probably be the first one to call for his head
It would make no sense whatsoever.
If he does opt for Caceres, Canna/Legro & Chiellini at the back, I wouldn't be surprised to see him balancing stuff out by playing De Ceglie as a left mid & Zebina on the right. God forbid.
Ok, I was wrong about this since he opted for Grosso instead of DC & Caceres instead of Zebina.
I didn't realise it was possible, but Zac just managed to make a crap formation even worse.