User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-32252462-20180419150401/@comment-2800:810:476:49D:A1C8:AAAD:F14A:5195-20180419160638

Sirzechs being afraid of Grayfia has nothing to do with power. It is rather used as humor, with Grayfia being more serious and strict in comparison with Sirzechs.