User blog comment:FairyRaven/Fairy Tail Chapter 360:The White Inheritance, Review and Commentary/@comment-5782007-20131115115517/@comment-7418318-20131115120652

You'd have to ask Mashima.

But the elite forces (or in OS's case the enitre guild I guess) of the three leading guilds of the Baram Alliance were the Ocasion Seis (six), Seven Kin of Purgatory and Nine Demon Gates.