User blog comment:Miskos3/Fairy Tail Chapter 488: The Two of Us, Always, Review/@comment-24951162-20160606213243/@comment-24200891-20160607035933

I doubt Zeref would reveal anyone any info about himself. Also even if he recognised Natsu as END, then why Mard Geer never recognised him? He was babbling so much about ruling in END's absense and didn't recognise him despite he was right behind his eyes.