User blog comment:Woohoot/Future Lucy and future Rogue timelines/@comment-904888-20130607115838/@comment-7418318-20130607122518

I just thought of another problem with the time travel: The required energy!

It took seven full years to charge Eclipse. While they had to move slow to keep things hidden, it still speaks of quite massive power requirements. I know that the two Fs made timejumps, but remember that F-Lucy only made a short "hop" and f-Rogue had seven years to gather enough energy for a seven year jump, but we are talking about a fourhundred year jump here.

I wonder if the Dragons might be able (and willing) to help them by providing the necessary magical power to recharge the gate.

On the other hand it is their only way to get back "home" to their own time. That might well help to motivate them to cooperate.