User blog comment:B214/Question and Answers 6/@comment-2607:FB90:602B:5C13:E835:4052:FCDA:7AE0-20190207133607/@comment-37165251-20190207184430

think about...he used only his normal Balance Breaker to kill a Executive Class Grim Reaper (which should be aroung Maou class Power). But even before he activated his Balance Breaker he had the upper hand if i read right.

With his Abyss Side Balance Breaker he is even more Powerful...so stronger than Rizevim is possible (in tearms of raw strength withot Sacred Gear canceller)