User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-5303512-20161227040743/@comment-5303512-20161227052024

That seed is what is what makes him END, yes, but that would also have to explain that he have the sinister demonic power from that growth which is his Etherious nature, his instinct, even instincts too have personalities, with Natsu transforming into his demon form and changing his personality is proof of that, I wouldn't be surprised if Natsu defies that fate to die and does something, like fight his Etherious self or something like that, his Demon Powers take on a form to fight him.

I don't think everything is perfect mind you.