User blog comment:FairyRaven/Fairy Tail Chapter 337: The Golden Plains, Review and Commentary/@comment-77.195.192.48-20130628104342/@comment-4829046-20130628105202

The bigger reason for the gate was actually to stop Zeref from creating Acnologia and F-Rogue was gonna indirectly use it differently on Acnologia so in the end, the arc is about planning to defeat the Dragon King.