User blog comment:Sithlord Andeddu/In the next Arc: The Return of the Dragons/@comment-29693708-20160820130127

interesting theory, maybe the dragons struck a deal with the fairies to keep some of their eggs safe till after acno is killed (which, most likely, will happen in this arc) but universe one revealed them early.

I have a hunch that Obra is a fairy (a spriggan) so zeref might well be in on the above.