User blog comment:Miskos3/Fairy Tail 530: Neo Eclipse, Review/@comment-5672982-20170409041910/@comment-7418318-20170409201543

That "trick" that Anna has isn't a trick. These ravines of time only exist because Anna and the Dragon Slayers traveled through time. It isn't a power that Anna conjoured up, but a phenomenon that happened when time was disturbed that Anna just happened to be the first to discover and subsequently hide from detection.

They didn't exist prior to Zeref constructing the Eclipse Gate and thus none of the Dragons could possibly have used the same thing.

And why do you think that Acnologia is so smart? We've only ever seen him deal with his oposition with overwhelming force. He never did anything smart.