User blog comment:Jho5689/Daimatou Enbu Arc Ending Predictions/@comment-121.54.92.102-20130517210350

i think your hypothesis was a bit correct but needs a lil spice

after they travel back to time: 1.) they will discover the history of fairy tail ,lumien histoire 2.) they will not kill zeref, probably to weaken him 3.) the next arc will be no appearance of lucy, she will become a heroine waiting for the prince to return 4.) after they weaken zeref, the fight will continue to the current timeline with zeref in weaken state

i think thats explain the ideas of: 1st) Zeref knows Natsu and why Zeref is in Sleep Status and false information of Zeref dying 2nd) Possibility of your Theory no.2(natsu disappearing in the timeline) 3rd) Fairy Tail origin, Mavis Vermillion true intentions when she built FT