User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-2405:205:118C:74F6:7DFF:974C:AC29:922E-20180425050623/@comment-26285797-20180425165319

I don't believe there is a way for Issei to use it anymore. Besides, Issei discarded the path of Domination, which the JD represents. It would be out of character and, really, a step backwards for him. His CxC and DxD are more than enough, and also Issei is, to a degree, pursuing AxA as a new power up alongside enhancing his DxD.