User blog comment:Jho5689/Fairy Tail 337 and onwards/@comment-1359322-20130624070938/@comment-7418318-20130624091546

There isn't really much to tell about F-Lucy's timeline.

The Dragons came, almost everyone died and F-Lucy went to the past.

But F-Rogue's timeline might be worth exploring. How were the Dragons prevented from coming through? How did F-Rogue lose Frosch? How did the create Dragon Manipulation Magic? How did he learn of the existance of the Ecplipse Gate and how to operate it? What are the exact circumstance of his killing Sting? Did he really fight and overpower Sting, or did the White DS pull something like Weisslogia and tell Rogue to kill him so he has the power to change the past?

As for why the F-Rogue future OVA hasn't been made so far, it might be because it would reveal some things that Mashima has kept in his back hand so far, like the four strongest Wizard Saints for example. Just saying "those four also died" would be rather unsatisfying.