User blog comment:IamJakuhoRaikoben/Chapter 334: Sin and Sacrifice, Review./@comment-5201137-20130608072239

I don't think anyone has thought of this, but Zeref could just pop in and decide to, if he actually dies, revive Gray with his all-high-and-mighty Life/Living Magic... I mean, it'd fit, with all the events in the arc- Zeref has to show up sometime.