User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-73.46.6.122-20160203220433/@comment-24.139.14.140-20160205115620

Remember when fought the mid-class/high-class Grim reaper only in balance-breaker ? And thats was vol 11, before he had his new body from great-red. He defeat someone with the same power of grayfia with Balance breaker in CCQ. So my guess is :

DxD = Super Devil (defeated Rizevim)

CCQ = Satan-class/Ultimate-class (defeated Euclid Lucifuge + balance breaker)

Balance breaker = Ultimate-class/low Ultimate-class