User blog comment:B214/Question and Answers 2/@comment-24098614-20140605224251/@comment-24502975-20140606153810

Well, the preview explicitly states that Ise will be fighting Rizevim as well, so I doubt he would just leave it to Crom Cruach.

Grendel acting as a catalyst for the Dragon Gate is interesting. And if Euclid causes havoc in the Underworld we may get to see Euclid vs Sirzechs.