User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-31.11.130.118-20171221210546/@comment-26926813-20171221212958

Issei and Vali in theirs DxD forms already have the power on par with Heavenly Dragons, who were in the list because their equal to Fenrir according to Volume 7.

But in some aspects above of them slitty surpass them. Issei in raw destructive power (but not as strong as Crom) and Vali in speed, tehnique and abilities. Of course they weaker than Hindu Gods and Dragon Gods, but all others mention in the list of Volume 23 they defenetly could defeat or fight on par (but to be truth, current top-10 is different from Volume 13)