User blog comment:FairyRaven/Fairy Tail Chapter 337: The Golden Plains, Review and Commentary/@comment-112.198.249.25-20130629134349/@comment-15267891-20130630063038

i think Future Lucy and Future Rogue did not return to their own time. They just disappeared from the present where they're not supposed to be. But to the dragons who returned to 400 years in the past, i think only Atlas Flame will be the only one with his memory intact of what happened. The others will not remember a thing because Rogue only manipulated them and only Atlas was freed from his control. ===> theory