User blog comment:FairyRaven/Fairy Tail Chapter 327: My Part Too, Review and Commentary/@comment-121.54.8.130-20130412212742/@comment-7418318-20130413080408

While I agree that Zeref is probably not in on it, we really can't tell much about his motives anymore.

He told Hades that he would kill him for the sin of making him forget the value of life. In other words Zeref might very well be back to his old, evil self, rather than the gentle, suicidal emo he was on tenroujima.