If You Talk To The Guard In The "Jar Room" As A Child AND At Night, He Says He'd Be Interested To Study Ghosts In The Future. At The Same Time, He Must've Died Along With The Other Guards. That Child In The Graveyard Had No Idea Of Hyrule Market I Don't Think. Also Remember, You Gave Him The Spooky Mask (ReDead Mask) As A Child. The Spooky Mask Has Side-Effects As In Distorting The Face. If That Child ACTUALLY Wore The Mask For Seven Years, He Obviously Got His Face Destroyed. There's No Curse By Ganondorf Nor Bongo Bongo. But The Child Wanted To Be Like Dampe When He Grew Up. Dampe Was NOT A Ghost/Poe Keeper, But Instead A GraveDigger. Although The Child Probably Was Evacuated Out Of Kakariko Village With Everyone And Found Hyrule Market. The Guard Probably Died In The "Jar Room" Most Likely Died. So, Yes. I Think That Child Is The Ghost Keeper. BUT AGAIN! (Sorry) If You Look Closely At The PoeKeeper's Uniform It Has A Triforce On It. Resembling That Of That Of What The Guards Of Hyrule Castle Wear. It's Pretty Strange But I Still Think This Could Be The Child. Theres More Evidence Of Him Than There Is Of The Guard.