User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-24098614-20150719020124

I wonder how Issei got this insane powerup that was able to kill Rivezim because if he is able to do this then he is stronger than Sirzechs or am I mistaken about his power level.

I want to know if by beating Rivezim puts him in the power level enough to beat Sirzechs in the story but I think this powerup is related to the flesh of Great Red and the link to Ophis as well.