User blog comment:Vitalius/The return of Oración Seis and Crime Sorcière/@comment-24066070-20131023130053

Considering the fact Jellal and Meredy absolutely want to destroy Zeref and all Zeref-related things, there is a good chance of them getting involved somewhere.

Besides Jellal would be one of the only characters who imo could beat a member of the Nine Demon Gates in a 1 vs 1 battle.

As for OS, that is more difficult to predict. They were once allied to Tartarus, so they may just join them. Although it is interesting to see Tartarus made no attempt to break their former allies out of prison, eventhough they were (apparently) imprisoned in the same building as the Magic Council used for their meetings, or at least nearby.

I think Hoteye would ally himself with the legal guilds and maybe the other Tower of Heaven kids may join "the good side" when they discover it were those Zeref-worshipping people who imprisoned them and made them suffer. Therefore the former slaves fighting Tartarus is somewhat plausible, but Brain/Zero would never join the legal guilds.

However, I sincerely hope they will just remain in prison. If they "become good" it will be through a process with endless flashbacks I have already seen.