User blog comment:Miskos3/Fairy Tail Chapter 367: Jellal vs. Oracion Seis, Review/@comment-24066070-20140117111057/@comment-7418318-20140117111858

Come to think of it... with Zeref wanting to destroy Mankind, his and Zero's aims overlap.

I wonder if Zero might escape OS and CS and ally with Zeref for the final arc.