User blog comment:B214/Question and Answers 4/@comment-24502975-20141224223321/@comment-24468758-20141225135853

JD should be around satan-class as Issei overpowered Shalba completely with an incomplete JD even though he consumed a snake, whereas he was strong enough even without a snake to withstand CCQ to a certain degree which is in terms of power definitely ultimate class.