User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-2601:87:8300:20D0:4578:499D:F51A:F5E6-20190801024042/@comment-10330822-20190804014156

I find Diehauser's situation to be a matter of honor. He committed what you might consider a crime for the sake of taking down Rizevim. Issei's showed this best of all how he goes from being disappointed in Diehauser to regaining his respect. Diehauser took a guinine issue he had with the Rating Games, faked treason, and used to help take down the leader of the terrorist organization. He never really was on Rizevim's side from the beginning, more of a double agent, but he didn't have permission, and he did take advantage of his situation to expose the King Piece users for the cheaters they are.

I'm not saying that didn't do anything bad. Cao Cao and Vali were indeed in the wrong for jeopardizing peace, but in the end, you have to understand that they are pardoned. Whether you believe Roygun did something bad or not to deserve her ban is irrelevant, because it doesn't change the fact she isn't pardoned. What's more, her crimes have to do with the Rating Games which they are now taking part in. Do you pardon a person merely because they feel guilty, or because their crimes weren't as severe as others?

Cao Cao and Vali really have nothing to do with the fact Roygun cheated, and quite honestly, if she wasn't caught, probably would still be cheating.

Really, when she came to Issei and displayed her love for the Rating Games and regret for ruining her ability to participate, I knew instantly that her goal was to use Issei as a way to compete again. Ultimately, the way she is being built into the story is as Issei's new Rook.