But my question remains, is there not a simpler way the tomb could have got to how it is, without a major move-around of the stones being needed?

In most sciences, people would expect to test the simple explanations first and be prepared to dismiss them if they can be demonstrably shown to be wrong. That doesn't seem to have happened here and I can't help feeling that everyone is favouring the more complex theories because no-one wants to offend Roy or criticise his work. I get that, but if his theory is to be accepted in wider circles, it will need to stand up to much more scrutiny and analysis than my ham-fisted comments.