User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-175.101.10.90-20130808170726

I believe there is some hidden meaning in this

"I had no reason to come to this age. I'm not an ally to anyone. I'm not an enemy to anyone. But still, if an age is about to end right now... I might awaken once again" — Zeref in "Acnologia"

and maybe he was referring to the DCW