User blog comment:FairyRaven/Fairy Tail Chapter 398: The Final Duels, Review and Commentary/@comment-31.132.65.59-20140901164646/@comment-24546844-20140901175028

I guess he means that Gray would only come back for the final fight as Silver's last words implied.

I guess Silver learned demon slaying on his own so it's not Tartarus fault. But it is for keeping him with them and for letting he see Gray so you still got a point.

You shouldn't underestimate Kyouka or overestimate Erza. Kyouka absorbed Sayla's curse, maybe she has done it to Jackal and Ezel too. And Erza is supposed to be exausted. About the antidote, those thngs tend to take time to act in one's body and they've been poisoned for too long so I don't see then joining anytime soon. Same for Natsu, Lucy, Gajeel and Juvia. I guess Mashima still got some cards on his sleeves for this arc.