User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-78.48.6.54-20190113221154/@comment-10330822-20190114045245

He should be able to at some point. Issei's use of the Pseudo DxD form is causing the Dragon God Aura to slowly covert his soul into a more Dragon God-like state. In addition, Ajuka stated if Issei could have Ophis and Lilith work in sync, the form would be much more stable too. Ajuka stated that if Issei did this he probably could unlock the abilities of Ophis and Great Red in his body and achieve a mastery over DxD G, and possibly unlock a new form, AxA.