User blog comment:B214/Volume 23 discussion blog/@comment-30924344-20170319035400/@comment-10330822-20170319055939

Here's the thing. If Ajuka is right, this is not Ddraig or Ophis, this is a natural ability Issei gained after being reborn from Great Red's flesh. However, it sounds from Ajuka that he couldn't use it because his pieces hadn't mutated until he underwent "deitification", and even then he doesn't have all the "parts".

In other words, AxA doesn't have anything to do with Scale Mail or BxB, it is its own thing.

The Dragonification I feel is something Issei can just do if he had better control over his demonic energy, I don't think he needs a special form to use it.

Rather, I feel this is a special ability, something without a standard form that stacks on his other forms. Whether it mixes with something like Balance Breaker to do what you described, is something else entirely.

Essentially, things like CxC and DxD have been adding onto Balance Breaker, which means that logically speaking AxA would be less, not more.