where was the yata when itachi was absorbed by chibaku tenis ?
where was the yata when itachi was affected by tayua's sound ginjutsu?
where was the yata when itachi was affected by kabuto's light and sound jutsu?
it was useless ,do you know why it was useless against these attacks? because it can't defend against untouchable attacks(gravity,light,sound)
kamui can warp it as it is untouchable attack too,all ranges kamui can warp its user without warping any part of yata or susano
it is s/t depend on the concentrating of the mind(like kakashi did when he warped hatchibi although he was inside kuarma cloak,kuaram cloak didn't block kamui)
it protect one side of susano so any strong attack which can affect sasuke's susano ,can affect itachi's one from back as well, as the dust,hirudora,sakura and tusonade's fist,giant biju doma,......etc(from the back)
if the attack was wide enough to surround susano so that it can affect the back too
but about break it ,i don't see it breakable
