User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140110163738/@comment-1359322-20140117124700

Actually Issei didn't outsmart Riser, he only caught him by surprised but i'm not going any further on that.

Well i don't see any needs to further this discussion. After all, Zephydor's role in the story was simply to show Sairaorg's strength. He fulfilled his role and probably won't be touched on anymore.