User blog comment:DarkLordZeta/Chapter 427 review/@comment-76.121.234.236-20150407031820/@comment-1359322-20150407032821

Just because Natsu's strength increase and character change doesn't necessarily foreshadow anything. If Gajeel or Gray shows the same level of improvements does it mean that they are becoming E.N.D. or undergoing Dragonification?

And Natsu change in character is something that occur after Igneel's death. If Natsu remains being his past self, then Igneel's last words to Natsu would be like a joke.