Why are you even trying to make an argument like that? The point, as I'm sure you very well know, is Tolkien wanted other people to contribute original material

Why are you even trying to make an argument like that? The point, as I'm sure you very well know, is Tolkien wanted other people to contribute original material to Middle Earth on their own terms. He was all for it. The opinion of his estate since his death is different of course, but that's got nothing to do with his own opinion.