User blog comment:IamJakuhoRaikoben/Chapter 457: Naked Battle, Review./@comment-5268982-20151022174618/@comment-5303512-20151023143829

@Nick & Derax, well Zeref could always hold on to the idea of the Eclipse Gate if ever he had the opportunity to use it. I mean even though he claims that he succeeded in reviving Natsu, we have no idea what happened between them after he got out of that chamber in chapter 436. It could have something to do with Natsu being E.N.D. and things didn't go the way Zeref wanted.