User blog comment:B214/Volume 23 discussion blog/@comment-77.188.244.180-20170422173639/@comment-79.25.167.4-20170422222136

What Issei need is improving his own power, his base abilities. In his normal Scale Mail I think he is still far from being the strongest Sekiryuutei (he is the first to have had more than the Scale Mail, obviously with CC and DxD he is the strongest, just to be clear). Before to obtain other mode, he has to improve his base powers. Think to Euclid with just a replica of the boosted gear scale mail. Issei has to become at least at a Ultimate Class Devil only with his Scale Mail, than even the other modes will become incredibly stronger too.