User blog comment:FairyRaven/Fairy Tail Chapter 301: The Dragon King, Review and Commentary/@comment-3970561-20120928192704/@comment-5268982-20120929092514

Natsu and Zeref are connected. Acnologia and Zeref are connected. So maybe Natsu and Acnologia are connected...it makes sense! Maybe Acnologia is Zeref's counterpart or something, but this still does not explain the connection with Natsu. We'll see I guess!