User blog comment:FairyRaven/Fairy Tail Chapter 325: Unity, Review and Commentary/@comment-5444132-20130329114000/@comment-7418318-20130329142159

I agree, though them joining would be less of a stretch than Gajeel joining without so much as an appology for torturing Lucy out of boredome and against the advice of his own guildmates.

A very ironic (and interresting) developement would be if the two of them were convicted as traitors and ended up joining Crime Sorciere.