User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-32252462-20180321143728/@comment-31984046-20180321172234

First, the one who defeated Typhon was Ddraig ALONE, Second, Issei beat Vidar (Top 10 God) ALONE. Thirth, Mahabali was defeated by TWO, Super devils, one of then said to be DRAGON-GOD-LEVEL. Fourth, why are you mentioning Sirzechs and no, i don't think Issei can win against him. And i didn't even mention Ajuka (serious what are you saying??) Only Balberith is said to be Dragon-God-level. Verinne was only called a Super Devil there's nothing to prove that she is stronger than Sirzechs and Ajuka. Now for Kiba...sigh, Dude Fafnir and Issei are not in the same lvl... And the one who killed Fafnir was the original Siegfried can you afirm that Kiba is stronger than him ? and in Vol.20 Issei said this about Rizevim:

"several buildings had been reduced to dust or nothingness, and a massive crater had formed. Although it was incredibly destructive, this was the Maou’s son after all. —That was what I thought. …He was on the level of a Super Devil? Of course it was impossible. The silent pressure and absolute aura that could be felt from Sirzechs-sama and Ajuka-sama; this bastard couldn’t be compared to those two Maou-sama at all. I thought that among these three Super Devils, wasn’t this bastard a few levels below those other guys?" As for the rest i'm not even going to respond that.