User blog comment:Ixarising/High School DxD Dream Battle/@comment-24421137-20140114074119/@comment-16281343-20140114075551

Zephyrdor isn't a Maou. His brother is, Falbium.

And nothing is said that the original Beelzebub is more powerful than Serafall. I think the original FGS is more or less equal with the current FGS, that is without Sirzechs and Ajuka going all out.

~Back to the topic. Cao Cao is a master technician. He was able to dominate the Gremory Team, part of the Vali team and Azazel while protecting Georg. That just states how powerful Cao Cao is. And don't forget, he is a human.