User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-3965848-20150517200407/@comment-26285797-20150518161721

IMO, Reflect will be useless. I'm placing money on Vali's "answer" to his quest to conquer the EJOD. IMO, Issei should be the one to defeat Rizevim because he's the only one who is in a position to defeat him. I know theirs Sirzechs, Ajuka, and other beings, but I highly doubt they'll come out to fight him. The only reason that Michael fought was because the fight took place in Heaven. Leaders of factions do not fight on the front lines because it would be bad if their respective group were to lose their leader.