It's no doubt flawed, and always has been. But in this case there's no excuse for having both Barzagli and Grosso ball watch while Marchisio trails Gomez. Even in a zonal system you should be able to read the play. I mean, there's no attacker running from deep and Melo has that area of the pitch covered. Another attacker is parallel with the crosser whom Barzagli let get away, so Grosso is there all by himself watching the play develop. There's no excuse for that, whether we deploy a zone or man to man system.