User blog comment:Xilinoc/Ch. 603 - What The Hell/@comment-24384892-20141029164247/@comment-24963493-20141030214633

They could still be shown off in like a flashback of previous Quincy battles. I feel like that's a likely option, since there have been flashbacks before big battles before now. They could also be used by Yhwach in battle since he absorbed his soul pieces back, though personally I think he just gains a boost in power that allows him to stay fully functioning rather than he gains the Stern Ritters' power.