In my opinion, debates are all about spin. They're too short to allow proper analysis of the responses, and mostly concern the personalities of the people.
Two examples: T.H. Huxley and Samuel Wilberforce, and a round-table I once attended with Dijkstra and Larry Loucks of IBM, along with a couple of other professors who were completely outclassed by those two. EWD was slow and very precise, it was clear that he was thinking deeply about the topics, but he didn't actually say much in the time alloted; Larry was fast, facile, and rather shallow, he was of the IBM style (he who talks loudest is in charge).