Lu had Leukemia, and was quite cheerful up to the last. If you want to know what he looked like, he appeared as an expert witness on the Discovery program about the Transat Airbus that ran out of fuel near the azores.
He wasn't necessarily anti-Robinson. It's just that whenever "conventional wisdom" applies, there is always someone who can apply a well-aimed pinprick and question it - Lu was one of those guys. He sure wasn't one of the crowd.
Phil