User blog comment:Omega natsu2/Fairy Tail Zero: Fairies in Your Heart, Review./@comment-7070784-20140718130853

Someone mentioned that what if Zeira & Jezelf are related or connected to Zeref aside from dark hair and similarity in their names, due to their death he could have been so depressed that he found ways to become who he is now, and thats why zeref was in tenrou island coz its a familiar place and not just because hes hiding in there, I know zeref is so old he is even connected to the creation of acnologia but its just a theory, maybe in the future well find out how mavis and zeref knew each other.