User blog comment:Woohoot/Future Lucy and future Rogue timelines/@comment-10543621-20130607072013/@comment-7418318-20130607073855

Originally the Eclipse Gate was build to travel back in time and kill Zeref before he got too powerfull.

That was the plan that Arcadios worked to archieve all the time and only later Hisui told him about the "Eclipse Plan 2" - turning the gate into a big cannon. It was only that Eclipse Plan 2 that came to be because of f-Rogue.