User blog comment:B214/Volume 22 spoilers/@comment-190.213.228.77-20160821180554/@comment-9595671-20160822030125

The only problem is Sirzechs won't be there to physically see it for a few... millenia? Is that the term I'm looking for?

I'm pretty sure he will, from what I've seen so far about Trihexa's core, it actually seems like his/her/its previous chimeric form was his more dangerous one.

I mean with the damage Trihexa initially gave, that seems like the only reason the leaders are able to fight it right now in that seal and still be alive to contact Issei in this volume.

If I'm getting any information wrong here, feel free to correct me on it.