User blog comment:B214/Question and Answers 6/@comment-24098614-20170331205750/@comment-30924344-20170331211450

If Ddraig was irrelevant because Issei wields his powers, then Issei would be irrelevant too because they both share the same powers and in fact, we wouldn't have got a story in the first place. That is why it makes no sense; a fallacy.