I don't have the impression that the participants did much of the relevant math. Few strategies were optimized and a considerable number weren't sane at all. At this point, delving into the depths of truly evolutionary IPD tournaments will not yield as much insight on the whole matter as it could.

There's a number of rules I have put together for developing successful strategies as well as theoretical observations on these kinds of tournament in general; if there is interest in them I can post them in the discussion area.