User blog comment:Xilinoc/Ch. 612 - DIRTY/@comment-24726378-20150122160710/@comment-5398287-20150122170305

Not quite. Byakuya just said they'd be accompanying Mayuri, which is technically true - he just left out the fact that they're mind-controlled zombies. Shinji giving him that sideways glance was him being suspicious about the wording, I think.