User blog comment:Omega natsu2/Chapter 356: Tartarus arc - Prologue, Predictions./@comment-49.144.144.102-20131014012259/@comment-7418318-20131014083156

No... or at least not yet. Unless the broke out while the team was in the Sun Village, the OS members are still in prison.

And I doubt that the surviving GH members would have the same goals as Tartarus. And Tartarus isn't likely to accept them either after they failed so miserably against Fairy Tail.