Fordim does such a better job at summarizing the thread than I do...
I suppose I might just be repeating facts, but the reader is his own authority. How he interprets the facts of Tolkien's literature is his own business, and what he makes does not necessarily become canon. Everyone can have their own view of M-E. Tolkien was a human, therefore, he was not perfect, and anything he made can not be completely exact.
To Conclude this quick reply: There is no "Tolkien Canon", some magical reference one may pull out and show to others that their beliefs may coincide. It is completely impossible.
But do not lose hope; individual interpretation is not the end of complete interpretation. Many people agree about major ideas in Tolkien, things pretty much unchangeable: ie, Frodo loses one finger in the destruction of the Ring. Some will disagree on minor things: ie, Gollum's fall was chance/purpose. We all agree that he fell, therefore we have some ground for harmony and agreement.
Perhaps we can overlook the minor differences we struggle with and create the new interpretation that Fordim suggests.