User blog comment:Woohoot/Future Lucy and future Rogue timelines/@comment-904888-20130607115838/@comment-7418318-20130607120729

Even if they could operate the Eclipse Gate well enough to go back to a specific minute of a specific day, that's still only half the equation.

But the Dragons themselfs (particularly Atlas Flame, since he's already an ally) might provide the necessary information to know which day they should aim for.