User blog comment:FairyRaven/Fairy Tail Chapter 416: Tartarus Arc: Final Part, Review and Commentary/@comment-24536822-20150120195747/@comment-9595671-20150121230801

And then we have to remember that their guild was a Dark Guild under the Oracion Seis, so in a sense Brain was their actual Guild Master.

And the Zato and Gato example isn't the best either cause both are labeled as members.