User blog comment:Miskos3/Fairy Tail 520: Dragon or Demon, Review/@comment-29874610-20170204151505/@comment-21119641-20170205222329

Zeref's flashbacks clearly showed Natsu as a resurrected kid, who he had to lend to Igneel because the boy was so disobedient. So you're gonna' say Natsu was evil or would be evil? Igneel clearly couldn't kill END because he loved him, Zeref himself said Mard was crazy and came up with stuff.