There are many characters that would have knowledge of the keyblade's design AND the black box. A whole council should've been a thing in this series, those that were once apart of the AoFT that monitor the action of the worlds alongside Yen Sid who leads them. We've got allot of potentials: Flora, Fauna, Merryweather, Merlin, Fairy Godmother, Blue Fairy, Shantotto, Queen Clarion, Mama Odie, The witch from Brave (Pardon me cause I haven't watched it as much), Rafiki, hell the fucking CHESHIRE CAT could fit into this. There're allot of characters that COULD steer the characters right. Instead we got Yen Sid who watches everything like GOD and decides to use all his almighty power on Shadows, and Merlin who's only obsession is Winnie the Pooh. WASTED. POTENTIAL THAT'LL NEVER COME TO BE. THANK YA VERY MUCH.