Board Thread:Theories and Speculation/@comment-31477926-20170702121758/@comment-734582-20170821105100

Namikazenaruto9 wrote: And Itachi Didn't get that chance to form Susanoo. So...... They casually walked in on Kabuto and talked before starting the fight. Again, if Yata is so invincible, why doesn't Itachi have it up from the start, protecting Sasuke from any potential harm that can conceivably be done? It can change size and shape apparently, so he could always size it right, and it can stop anything, so there's no risk it's weakness is figured out since it has apparently none.

But that's not what we see. Even in Edo Tensei Itachi didn't use it, not against Nagato nor against Kabuto. Yet, Chibaku Tensei was practically a death sentence to Naruto last time, and Itachi didn't bother with the Yata Mirror there. He didn't bother with Yata to protect Bee and Naruto. He didn't bother with Yata against Kabuto's flashbang, nor against ANY of his other techniques, even though the flashbang left them dazed and vulnerable, and so did the Chibaku tensei.

It simply cannot be what the Databook describes, because else Itachi would've used it all the time against everything with no downsides.