User blog comment:FairyRaven/Fairy Tail Chapter 425: Sabertooth X792, Review and Commentary/@comment-96.24.244.24-20150326054823/@comment-7418318-20150328072508

Could be. Arlock was just titled as Priest.

It could be possible that each "community" or branch is lead by a single priest and followed the High Priest who's in their head-quarters along with the elite troops.

And Gray could currently be in a branch due to being new and unproofen.