Board Thread:Naruto Discussions/@comment-24142271-20140923123755/@comment-22985334-20140923135103

We have no clue how old Mangetsu is, and if it was said that Mangetsu could wield it then that means the sword liked him and allowed him to use it. Also, Fuguki never fled the village and since Mangetsu was a member of the Seven Ninja Swordmens before Kisame, he probably used the sword once before Kisame was a member.