User blog comment:Xilinoc/Ch. 592 - Marching Out the ZOMBIES 3/@comment-11446176-20140806073523/@comment-6657474-20140806105936

I can only see that happening if Mayuri is defeated (possible, but since he seems to know just about everything about the Gotei Thirteen Captains and other Bankai users, somewhat unlikely since he could pretty much counter or nullify anything they threw at him). On the other hand, Isshin could show up and face off against Hitsuguya allowing Mayuri to focus his attention on Gigi (plus it would give Kubo an excuse to properly showcase what Engetsu can do as well as show it's Bankai, which would finally explain what it is about it that makes it so tough on Isshin's body). Since Gigi pretty much confirmed that Hitsuguya was still alive (if just barely) I have to wonder if Gigi is killed, if the effect will wear off.