User blog comment:B214/Volume 23 discussion blog/@comment-29963364-20170531001243/@comment-29963364-20170531020104

When I say "most powerful," I'm not saying who is "strongest" (as in who would win in a fight). I'm saying who is the most "powerful" (as in who has the most raw power).

1.) Ajuka (who is on par with Sirzechs) = x10 Satan-Class

2 & 3.) Issei/Vali (in their DxD forms) = Heavenly Dragon-Class (8-10x Satan-Class)

4 & 5.) Diehauser/Grayfia (Satan-Class)