User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-5303512-20170204123939/@comment-21119641-20170204134114

They are the same entity, the difference is, END is an "essence", not "someone". Natsu was brought back with Demon Power, and created by Dragon Power. Of course they are not the same, if they were, this conflict wouldn't exist. But the nature of their thing is the same. It represents a part of your being, Natsu's dialogue implied he either rejected or accepted both as part of his being, which led them to crumble. Plus, as I said, if END was really someone, it would have resisted.