User blog comment:Raababukk/Possible New Power ups for Issei Hyoudou/@comment-1359322-20131024073243/@comment-24331253-20131229184644

Wouldn't you normally master your own power (your body) before mastering other powers. It's like a baby trying to walk before learning to crawl.

I think if Issei does not increase/learn his own body's physical and magical power, he would just be completely relying on the boosted gear and his capacity for storing the boosted gears increased/boosted power will not increase significantly. It will just be slow.

Isn't that why Euclid Lucifuge was able to overwhelm him easily. Because he has higher demonic powers.