Board Thread:Questions and Answers/@comment-10797017-20130627100621/@comment-5657895-20130903161900

Nah, it can't be either Ukitake or Shunsui. One of them has to be either Mayuri, since we didn't see him fight against the Wandenreich, or Urahara. Shunsui and Ukitake are powerful, but I think Yhwach thinks of them along the same lines as he did Yamamoto.