User blog comment:FairyRaven/Fairy Tail Chapter 388: Erza vs. Minerva, Review and Commentary/@comment-24039250-20140613132736/@comment-24367018-20140613213825

^ This.

To be fair a lot of people have been waiting for other guilds to turn up. Sure it was pretty bloody convenient but w/e.

As for there being any chance of them beating Mard Geer, unless they've both managed to become White Shadow Dragons, then I highly doubt it.

The main likely hood for Rogue going evil is if Mard Geer kills Frosch, which is entirely possible.