User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-5303512-20161227040743/@comment-5303512-20161229055345

It Ian stated that this is inside Natsu's heart (basically his spiritual subconscious sorta speak) and Have even seen where the destination Natsu ended up? The same place that Igneel has been spending all that time inside Natsu's body.

If Brain and Zero are two entirely different characters then why aren't there two separate pages for both of them? Because they're not two characters, but two personalities both with different behaviors and characteristics. They are still the same person, Just different alias and behavior, that's pretty much it.

Natsu as END is completely deviating from the normalcy of his personality and his appearance, Natsu would never kill Zeref if he realized that it would cause his friends suffering, that is not his character, he would find another way, yet while as END, he is driven by pure instinct to kill Zeref and hatred. You should come to accept that by now that while they are the same character, their personalities are not.