User blog comment:B214/Volume 21 info & spoilers/@comment-26285797-20160218050953/@comment-26285797-20160218150726

Oh! I forgot that he didn't mention Annihiliation Maker, Dimension Lost, Telos Karma, Innovate Clear, or Incinerate Anthem. It be pretty awesome if Leonardo and Georg made return appearances, but it'll still be awesome to see the BBs for Canis Lycaon, Absolute Demise, and Sephiroth Graal. On the note about TK and IC, I'm sure we'll see them eventually. With 7 to 9 more volumes of DxD, I think there's a high likelihood. What a lot of people probably don't realize is that Ishibumi hasn't actually thought it out that far beyond a few general details.