I'll try, but I have to say up front, just to make it clear, that anything I say about his thought or motivation is speculative. And if I'm wrong, that's me being wrong not him.

The crux of the issue seems to be his lambda calculation, is that fair to say? He uses it to differentiate the eight major planets from the rest of the crew, in his paper, and you find that hard to reconcile with his current stance.

Is that a fair summary? or is there more that we should add?