User blog comment:B214/General Discussion/@comment-30329599-20161114002203/@comment-10330822-20161114013732

Well the ironic thing is about Ddraig and Albion is they basically can create an infinite loop combo. That is probably why their fight caused the Three Factions to stop fighting, just to stop them. Ddraig can double his own power without limit or transfer it to someone else and Albion can divide another persons and add it to his own power without limit. So, assuming the capacity of Issei and Vali gets big enough, they could literally feed off of Issei's power indefinitely. Issei could continue to boost himself up or transfer that power to Vali, and Vali can just divide Issei powerful and add it to his own, allowing more room for Issei to boost. So the real secret is that they are already set up as probably an OP combo, one that would logically rival the power of Ophis's Infinity.

What's more, both of them are technically Devil Dragon Kings, but Vali is more devil than Issei, and Issei is more dragon than Vali, because Vali is descendant of Lucifer, while Issei is pseudo True Dragon.

I'm more curious if they can master Dragonification and find a way to turn themselves into full dragons, similar to how dragons can shapeshift into humaniod forms, if that can increase their overall power and capacity.

If that was a thing, you might see them grow into larger and larger dragons, true Kaijin, and then be powerful enough to tear Trihexa to pieces and save the Satans and Azazel. That I feel would be a true ending for the story, worthy of the arc name "Red Dragon Emperor of Blazing Truth and the White Dragon Emperor of the Morning Star".