User blog comment:Miskos3/Fairy Tail Chapter 472: Laxus vs. Wahl, Review/@comment-86.66.207.24-20160209095755/@comment-7418318-20160209131606

I highly doubt it. There's far too much standing against such a theory:
 * 1) Zeref knew very well that there were living Heartphilias. They were part of the plan to bring the Dragons into the future and without them it wouldn't have worked.
 * 2) Zeref watched the GMG through they eyes/reports of Obra, so he must also have been aware of Lucy's existence. If she was so important to his plans, I'm sure he'd have checked her out, or sent some minions after her, rather than just assuming it's a coincidence that she's named Heartphilia and is s Celestial Spirit Mage too.
 * 3) Brandish knew that Layla had a daughter, even though she didn't know the exact identity. If Brandish knew, I doubt Zeref was ignorant of that fact and yet he again he didn't put any effort into finding out this daughters identity, even if he skipped her in Obra's reports.
 * 4) Zeref already had a working Eclipse Gate that he could have used to travel into the past to kill Acnologia before even becoming a Dragon Slayer and/or to prevent the death of his parents and brother, but instead he sent the Dragon Slayers and with them the Dragons into the future. If he could have done it back then, but didn't there must have been a damn good reason. And I doubt such a damn good reason would change over time.