Board Thread:Theories and Speculation/@comment-27924662-20160409212201

I have seen several user continuously arguing about it being avoidable, it's never been mentioned either in manga or anime that it is avoidable furthermore if it really was than why would black zetsu say that the used of the blade and yata mirror made itachi invincible??!also I observed it's made of sake, why would kishi got to such extent of even describing the composition of the sword?ANY THOUGHTS! 