True but, do the spin anyway. Itachi admitted he would have problems with Guy. We know they didn't want to fight in reality but lets be honest Guy might do some damage to Itachi. I honestly think Itachi is the Highest Quality of shinobi in Naruto considering all factors and angles of what a shinobi is but I still think Guy has too much in his repertoire for Itachi to handle. Kakashi as we all know is childs play to Itachi, but to Guy he is one step ahead now why would that be? Because Kakashi has a higher grade of Taijutsu then Itachi as well as a Sharingan, along with an array of Jutsu to counteract Guy's Taijutsu in which still would be difficult of course. But manga and anime prove this so I shouldn't have to. Oh, and Itachi has low chakra reserves is another reason Guy would probably smash him to bits.