User blog comment:FairyRaven/Fairy Tail Chapter 407: All for My Demise, Review and Commentary/@comment-24490201-20141101160852/@comment-24490201-20141101163835

But come to think of it, I doubt Natsu will be END. I think he is only a part of it.

I think END was split up. A part of it was sealed in a human while the rest was a demon, which was sealed.