User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29874610-20170204151505/@comment-5303512-20170205024938

Only END creating Tartaros was a lie, nothing else Mard Geer was confirmed a lie. The seed was never shown to be dormant or even existed until the book was shot. No, piercing the book did not awaken it, that is totally false, the when it was pierced, the seed development according to Porlyusica, after Brandish returned it to it's original size, that was when it was awakened, that is what happened, don't believe me, go re-read the chapters yourself.

By your logic, the fact that Natsu did not die when the seed died is a complete retcon since they are of the same being and thus tethered to his existance since Natsu IS END.