Board Thread:General Discussion/@comment-4957813-20131130185522/@comment-5398287-20131209011536

We haven't even seen Shunsui's Bankai yet, and it wouldn't matter if we did: Yamamoto already confirmed that Shunsui is one of the few Shinigami with a dual Zanpakuto, and the only one whose sealed Zanpakuto exists as two swords.

You seem to be misunderstanding something here. When Yamamoto was talking about dual Zanpakuto, he was referring to Shikai alone, not Bankai.