User blog comment:IamJakuhoRaikoben/Chapter 373: Life or Death?, Review./@comment-2214433-20140302221321/@comment-4829046-20140303091036

"how could Natsu = END?"

Allow me to explain. For some its just the wild speculation with no real basis other than Zeref's connection. Others on the other hand have formed various hypotheses for it to be possible like Igneel being unable to kill this mysterious END and Natsu have existed for over 80 years(400 years) All in all, its not really far-fetched even though it will be stupid if Natsu actually is END.