TD,
I don't have an encyclopedic memory of most things, including those rankings, but recall a few oddballs on there. Why PD was left off, I don't know. Hey, I consulted there about that time, but I don't recall if I voted for it or not. It was around 1980-1985, no? We also have to recall that many courses now on lists weren't on them back then, when GD focused on difficulty, so oddball choices might partially be explained by the values of the time. Not sure, really.
In general, ASGCA used to feel that rankings were best left to others, but things seem to have changed. I guess we can count on this "new" idea for rankings to surface every 30 years or so, just over one generation apart, long enough for every one to forget the pluses and minuses of such an idea.