User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.243-20160806162232/@comment-9595671-20160806180556

Yeah, that's possible. The Old Satan Faction stopped attacking after Volume 12 simply because they had been crippled to the point any action would probably kill them. Meanwhile Rizevim's actions eventually went insane, especially after he freed Trihexa through his own death.

Those actions plus Trihexa's damage and maybe even possible the reveal of the King Piece has made any survivors seriously look at their previous actions.

Bina could easily be the strongest out of the survivors, so this is why she's with Issei if they're considering trying to return to the Devil's society as it's being changed for the Seven Satan system.