Board Thread:Theories and Speculation/@comment-30241447-20170503042327/@comment-7292165-20170516175053

The problem here is Itachi never really fought a jinchuriki in the first place for him to have to seal a biju. And we don't even know when he gained the blade. And we don't even know if Kisame knew about the blade's ability either. I'm quite sure nobody is hyping Itachi up to say he can easily beat Kisame, if beat him at all. Also, just because the blade may be able to seal away anything, and that is a big if, that doesn't mean you'd be able to. You gotta be fast enough. A big target would make it easy. I also would like to point out that Orochimaru may have been stationary but he did not see that attack coming. He of course was not worried about it for some reason, which means he did not even have enough information on the weapon to no it seals whatever it penetrates.