User blog comment:B214/Volume 23 discussion blog/@comment-30924344-20170319035400/@comment-10330822-20170319044754

Yeah, I noticed Issei hadn't been using anything from GR yet. The body was all he was using in how he was using DxD G, and Ajuka was hinting that if Issei mastered GR's power, he could use the DxD with ease.

Personally, I feel that's how the power can be AxA, which normally would mean its below Balance Breaker, its a natural ability, something seperate from his Sacred Gear and Ophis.

My guess is that it has something to do with GR's "illusions". He is the Dragon of Dreams, so GR's body probably gives him the power to will things into reality. In short, by mastering the power of dreams, Issei can will himself to be master DxD G, that could be why Ajuka is talking about it "changing the world", its a reality break move.

As for ExE, I almost feel that may tie in with the ExE group and the UxLs, like Issei achieves something when they attack, like a pseudo hybrid form.

We all know this series ends with Issei being stronger than anyone, he's already Heavenly Dragon-Class from beating Apophis, now were working on full Top 10-Class status.