I am curious about how Dan gets such great recordings from his co-hosts, who are remote. I'd have thought they record audio natively then upload him a high quality audio file with time sync, but then I remembered that he does these shows live, so that can't possibly be how it works.
I can't speak for Dan's other shows but I co-host The Ruby Show which was on 5by5 until recently and we record separately and then edit them together. No particular time syncing beyond recording at the same time though.