User blog comment:Ultraprime2/Edolas Counterpart - Dragon Theory/@comment-68.68.72.62-20120318025709

Isn't it also possible that Zeref is the Edolas counterpart the Aconologia? And since Porlyusica most likely had magic in her (Since she is a dragon's counterpart thus a more pure mirror than the dragon slayer's counterparts) then the others Edo-dragons would have as well and were transfered to Earthland as well