User blog comment:B214/Volume 21 info & spoilers/@comment-213.120.234.130-20160325144049/@comment-1359322-20160326015736

@anon, it's simple the Maou needs to be someone powerful that can act as a deterrent to prevent others from attacking the Devils, not someone influential from the Devil side. The Bael may be strong but it's mostly on the political side, and the fact that they were the ones who led the Devils after the death of the original maous. So they have lots of influence on the Devil side, but that's only the Devil side, it doesn't apply to the world. Who's to know when they'll be attack from someone like Hades. It'll be meaningless for them if the Maou the figurative leaders of the Devil look weak and incapable of protecting their race from external threats.