User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29874610-20170204151505/@comment-5303512-20170204192730

That does not make sense, Igneel spoke as if Natsu was a human all along. That demon seed said that it was END, nothing about demonic power. Besides destroying the seed would kill Natsu by that logic if they were the same whole time.