User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-33341107-20190118091645/@comment-10330822-20190127013033

I agree, the fact that Diehauser still isn't considered Super Devil-Class should be a strong indicator he's not untouchable. We've been spoiled in this series seeing the literal best this world has to offer. Despite the fact Issei's only been a devil for a short while, he's already being considered for the Satan position. That alone shows that the heads of Underworld acknowledge he rivals Diehauser in terms of ability. The problem is just his feats, its why they feel Issei needs to at least reach the Semi-Finals to be made a Satan. And you know what? If he beats Diehauser, that is in effect, what will happen.