User blog comment:IamJakuhoRaikoben/Chapter 497: The Winter Mage, Review./@comment-5303512-20160809031824/@comment-27337151-20160809130637

@ Miskos: Yes, you might be right. But in the tartaros arc Zeref said "either you or E.N.D. will reach me" to natsu, hinting that they are two distinct existences.