User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-95.90.224.203-20171101183240/@comment-177.133.240.86-20171102123715

Issei is constantly powering up and his body can't keep up with those powers, unless he manages to control Great Red's and Ophis's powers correctly within his body. He is still part human, so you can't expect like, he gets a new power and just because he has all these powers together that he will be able to control it fully. He entered a coma state after using Diabolos Dragon at its max. I know you want him to get stronger, I also do, but that's not a reason to call him pathetic for having some drawbacks when a human uses a God-level power. We might see a new one when Issei's peerage fights against God Alliance Team