I haven't read the whole thread so I apologize for repeating if I am but has anyone considered the Begger (Hyrule Castle Town as a child, Kakariko Village as an adult) as the missing Kokiri. He bears a striking resemblance to the know-it all brothers (red hair, green clothes, hat pushing hair into eyes, has no parents) I remembering thinking about him the first time I saw that stone's message. He also lives on the streets begging for everything he gets kinda like he tried to explore a new world and things just didn't go as planned. I'd also like to add that he seems a little bit older than the other Kokiri as if he began to age as soon as he entered Hyrule (although it's not canon that the Kokiri age outside of the forest, it seems to me at least to be a widely accepted theory and the ending of OoT proves they can leave the forest.) No Hylian has to beg for anything, no other Hylian child is implied to be parentless, I mean we even find out Grog has a hateful papa waiting at home for him. I know this is just speculation with no REAL basis but he just FEELS like a lost Kokiri to me.