User blog comment:Miskos3/Fairy Tail 512: Sting, the White Shadow Dragon, Review/@comment-130.105.140.154-20161130081519/@comment-4829046-20161130143926

@Cap Torch You are bringing up old theories though. The whole thing about END being the origin and all that was just what Marde Geer, who did not even know that END was just an abbreviation, believed. Zeref himself revealed that Natsu was his masterpiece, his strongest demon. All the other curses tied to his other creations already existed by then. He made the current Natsu after countless trial and error and basically gave up on creating more books after that point by conjecture.