huh...I don't think it's speculation...when you "talk" to the tree, tatl or tael or w/e her name is tells you that it has such a sad look or somthing like that.....then we get the story from the butler....and at the end he is almos crying next to that misterious tree.....I think it is pretty...
I think he reaches termina when he falls through that tree....the moment he lands he is in termina IMO. As for the butler/son thing, I had completely forgotten about it....that is one of the most sad and creepy momens in any zelda game ever!!! Skull Kid has got to be one of the most evil...