User blog comment:FairyRaven/Fairy Tail Chapter 428: When We Take Different Paths, Review and Commentary/@comment-24277053-20150415000755/@comment-1359322-20150419015941

Well we still don't know if Gray is actually just pretending to be a member or he actually joined them sincerely. At the end, it might just turn out to be a ruse that Gray joined Avatar, and he ended up helping Natsu and Lucy instead.