User blog comment:B214/High School DxD BorN Episode 9 Review/@comment-26209278-20150531212023/@comment-25792629-20150531214122

Issei's JD will not appear again as far as the LNs are now, though for the future... who knows.

Vali's JD will appear but I don't think it'll be in this season, I can't remember entirely when he enters JD again but I know for sure he does in the LNs