User blog comment:FairyRaven/Fairy Tail Chapter 356: Tartarus arc - Prologue, Review and Commentary/@comment-112.205.13.191-20131020022106

There is also a possibility that Jose Porla of Phantom Lord would be back for revenge after the events in the Phantom Lord arc.

I am also looking for the merging of the dark side along with Tartarus are: Jose Porla and other PL members, Remaining Grimoire Heart members, Oracion Seis, and of course Ivan Dreyar and his Raven Tail members (with the exception of Flare now she is in the good side) Also Jiemma who is looking for revenge.

Again, this is just a prediction or theory i thought off..

Anyway, nice story for the beginning of the arc