User blog comment:B214/Volume 23 discussion blog/@comment-76.175.162.45-20170402043409/@comment-31137559-20170402063406

1.Vali has a limit to his power. He can't just divide anyone. We can say that Kokabiel was at the same level of an Ultimate-class devil.

2.Even if you aren't as strong as Ddraig and Albion, Heavenly-Dragon class is still pretty powerful. It would be more powerful than the majority of gods and god-class beings. Saying Dulio is Heavenly-Dragon class would make him the most powerful angel, stronger than Michael.

3.In power output, Issei is one of the best and it would be suicide for mostly anyone to take his attacks head on. But that doesn't mean he's stronger than Dulio. Among power-types, Issei is one of the strongest. Overall, he's still pretty powerful, but there are still those who can fight on par with him. And then there are those that use their techniques to push Issei into a corner.