User blog comment:Xilinoc/Ch. 588 - The Headless Star 7/@comment-6657474-20140712060641

Since Gizelle can't die by being cut, then it would make sense for Yumichika to be the one to kill him/her using the true form of his Shikai (or if he's achieved it, Bankai), since it kills the opponent by draining the opponent's reistu instead of by slicing and dicing.