User blog comment:B214/Question and Answers 3/@comment-49.14.211.70-20140630035611/@comment-16281343-20140630035835

You can both say that it is and isn't.

Each Maou has a role he's in charge with.

Imo, Sirzechs Lucifer seems like the one in charge of the General Affairs in the Underworld thus making him look like the one with the higher position.

The other roles of the Maous can be found in their pages. (Sirzechs' role is the only one not revealed.)