User blog comment:Omega natsu2/Fairy Tail Episode 204: Stake My Life on Hospitality, Review./@comment-24.90.187.181-20141019194717/@comment-7418318-20141019223418

For the reasons you already mentioned, I doubt that any GH members will make an appearance, except perhaps for Yomazu and Kakuzu (or however that pair was called again... the goat and the chicken) in a comedic cameo.

But they could pretty savely add old enemies like Death Heat Caucus for example.