User blog comment:Omega natsu2/Chapter 392: You Must Not Forget, Predictions./@comment-94.55.223.139-20140707162757/@comment-1776824-20140709000237

Deliora is the strongest of the Nine Demon Gates for the reason that he has a magic that can kill his comrades. By extension, Mard Geer is stronger than Deliora otherwise he would have not put him in that position, meaning Kyouka cannot be stronger than Deliora, otherwise Mard Geer could not keep the Nine Demon Gates from ever staging a revolt against him.