User blog comment:B214/Question and Answers 6/@comment-24098614-20170720014903/@comment-9595671-20170720121444

I could have sworn someone mentioned that part of ExE's role would be to help get them out early around the time that Vol 23's spoilers got released.

Something about Issei trying to fully manifest the power of Ophis and Great Red in him for one of his eventual power ups? (The ExE power up I think)