User blog comment:FairyRaven/Fairy Tail Chapter 356: Tartarus arc - Prologue, Review and Commentary/@comment-1359322-20131018133156/@comment-4829046-20131018133355

FTGM's Spirit :Thank you for bringing up the Silver thing. I was thinking though, what if they know how to fuse the Demon in the book with a regular human? That way the theory is still there. At least it would explain the grave. But I'm happy even if its not the case since I don't want him to be Gray's father.