User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20161218170008/@comment-9595671-20161221203306

@B214: I wasn't talking about unsealing Trihexa, I was referring to how the EX story didn't outright state they fully prevented time travel incidents or the UL from doing it again, and that maybe it could be involved. Unless Ishibumi states if it will or won't happen, the possibilty exists.

@Omega: I think I've got an idea that explains how your idea of an epliogue way after the EX timeline's current placement where Trihexa has been dealt with and the leaders freed could work. The Volume 21 afterward has Ishibumi say the UL come from the ExE world.

The story's world is the DxD world, so here must be a counterpart to Great Red there that it's poeple likely call ExE, and it could possibly be stronger than Great Red, full pwoer Ophis and Trihexa, which are said to be equal in the same afterword. It's possible the alliance could use this fact and trick said being into destroying Trihexa by making it think it's a trump card of their's.

Trihexa won't ever help them due to it's nature, but the leaders trapped inside will, and with Trihexa dead they'd have no reason to stay in the seal. From there, depending on if it has Trihexa's level of regeneration and isn't immune to Ddraig's flames or Albion's poison... well, then they'll likely kill it. End result is they win the war with the UL, the leaders are all free, and Trihexa's finally dealt with.