User blog comment:Blissfully Disturbed/Conspiracy Theory No. 2: Fairy Tail going back to their timeline/@comment-5170433-20120709022258

A really good theory but I don't think even with the power of all the mages in Crocus can focus enough magic power for Ultear to send every one back. To fill that hole in your theory what I think that will happen is the Eclipse Plan will completed. The gate Arciados tried to open is "The Change World" a.k.a the world where the dragons are. For some reason Raven Tail teams up with Zeref. Gildarts is brainwashed by Zeref. He shows where Lumen Histoire is. Ivan had no idea how to use it and goes out of control. At the same time the gate opens and dragons come out. Acnolgia returns and all hells break loose. Then your theory.