User blog comment:B214/Volume 23 discussion blog/@comment-172.58.17.208-20170402060034/@comment-30924344-20170402143328

But Issei, is at low Satan-class currently. He can fight the satans and four great seraphs, but it would be a bit of a struggle. Ajuka is the only exception because he has a true form like Sirzechs that makes him 10x stronger than the original satans like Sirzechs, so its impossible for current Issei to fight him and have a chance of winning.