User blog comment:Perchan/Fairy Tail 302 - In Which I Was Confuzzled (Eclipse Project)/@comment-3030647-20121004114553/@comment-4566819-20121005012523

My theory is that the door is open, and as they do go to defeat zeref, the dragons from that time start flooding into this timeline, which makes a kind of paradox world in-between and it could lead to many guild being destroyed in a single event.

Also i strongly believe that out of this, the zeref we all know isn't really him but a type of faker since he does look alot like Romeo Cobolt or a older future verison of him from the paradox future.