User blog comment:B214/High School DxD DX.4 discussion/@comment-31137559-20170901033719/@comment-124.122.12.137-20170905134801

It depend on whether Vali can pass to the final rounds or not, since I am 80% sure that Issei vs Vali match is going to happen. if Vali pass to final, then Issei is most likely to pass as well. it's unlikely that Issei will meet Vali in preliminary round because Vol 24 appears to be the last part of this round already.

well. there is a possiblity that they will compete in an unofficial match. but I think it's rather lame idea. a fight between two heavenly dragons should be held in more prestigious manner.