User blog comment:LastationLover5000/Fairy Tail 301 - In Which Hiro Has Been Reading My Things (The Dragon King)/@comment-3061966-20120928205851/@comment-4666155-20120928210425

Oh I don't forget, not at all =w= Lol after you smacked my idea in the face? Silly Zico. Perhaps Acnologia put down the order when he first became a dragon, since he would have still felt some tie to his old human self. Now...maybe he just became more insane until finally, he viewed humans like the opposing Dragons did, fodder.

That'd make since. Hell, for all we know, Zeref is half-demon. Explains his long-lived behaviour.

Coincidence or foreshadowing? Hopefully the former