Board Thread:Naruto Discussions/@comment-26431570-20181210002514/@comment-25122992-20181210120952

Firstly, Duy didn't kill all the swordsmen, at least three of them survived, according to Jūzō Biwa. And secondly, during the team's encounter with Duy, Zabuza was yet to become a member, with Jūzō being Kubikiribōchō's wielder as Zabuza's predecessor.