User blog comment:B214/Volume 23 discussion blog/@comment-31764731-20170726154553/@comment-2601:8C:601:5692:6544:46D:AC44:F287-20170811022945

@Pawn, as I stated in my above post, I more or less understand how you feel, but there is some in-universe logic that does fit, if you're willing to reinterpret some elements a bit.

First and foremost you have to remember that Ise's body was recreated by Great Red and Ophis. Its potential should be as infinite as the possibilities one can imagine. Think of it like this, before the loss of his body, his potential was like a medium-to-large sized lake filled to the brim by his existence and power which he was slowly carving away at the shores through training in order to make larger. His new body was more like a vast ocean that he doesn't come close to filling. In order for him not to lose himself within this greatly different vessel, temporary walls were erected to create the illusion that his body is the same. The power of DxD can easily be contained by his body, but the rest of himself still requires those illusionary walls to avoid dissipating. This is Ophis's role in the technique: to allow him to maintain himself without the walls while it's active, thus letting him use that vast ocean of power; and rebuilding the walls when it's done. The incomplete Ophis lacks the ability to do this perfectly on her own, thus resulting in losing something of Ise that first time. With a second set of hands (Lilith), she'll be able to more or less rectify that problem.

However, everything is already unstable due to the two natures of "infinity" and "imaginary (dream)" that his body is composed of, straining his very existence until he's able to stabilize himself. What's worse is the technique is distinctly that of "infinity" and thus tends to push his body towards that extreme when it is used. Without learning how to master the "imaginary" in order to bring his body back into balance, it becomes increasingly impossible to maintain himself even in spite of Ophis'S best efforts.

Of course, as Ise grows, he'll eventually be able to adapt to his new body and won't really need the "illusionary walls" anymore. And presumably, his body will be stabilized, either by it naturally finding a balance or him mastering the two natures and forcibly keeping them in check. However, considering he has yet to master CxC, he's a long way from such a thing. Hence, the current situation...