User blog comment:IamJakuhoRaikoben/Chapter 497: The Winter Mage, Review./@comment-5303512-20160809031824/@comment-174.25.56.203-20160811013358

Hey guys I've been wondering about something and that is why Zeref would seperate his brother between Natsu and his book half? Natsu came back as a demon so why would Zeref give his brother a handicap through his book and sealing it which would if destroyed result in Natsu's death when Natsu was created to kill Zeref thus he would die anyway I mean dosen't that seem strange to you?

On a side note: Shorya in the memories chapter Zeref dose call the book of end Natsu and talks to it where the book is told about Igneel as if Zeref where catching up with some he hadn't seen in a while.