At first I thought he confirmed it as being owned by Disney. He said the line as "they are, and were - the king, Taminella, Featherstone - on the list I sent to Disney". I wonder if he meant to say the line as "they are, and were - the king, Taminella, Featherstone - on the list I sent to, Disney". If Henson does own them (and there's not much Henson would own with those characters), then I wonder how they could have been on the original list (especially since Shemin said that he looked at a list of characters Disney has the rights to). And he said that Disney only didn't allow them because they're from productions not currently in circulation (what about YouTube?) and didn't think they're relevent to the books audience.