Tom
This is a very good question in one regard (i.e. trying to see which clubs have been the best in recording and tracking down facts regarding GCA), but a less satisfying one if one is trying to find some sort of meaning from the these facts.
Virtually all of my "knowledge" in these areas relates to mostly "great" courses in Great Britain and Ireland, and the more I look and learn at these courses, the more I believe that any "attribution" as to what they look like and play like today is far more due to the activities of and visions of golf club committees (collectively, over time) than any individual architect (or even architects).
To know how and when and by whom and why any individual changes were made on course X or course Y is mostly a trivial pursuit. In VERY rare occasions, Club X or club Y might use such trivia to make a point as to how their course might be improved today, by going back into the future, as it were. Maybe the ~ 2000 Merion 1930 retro look project is a good example of this, or the fairly recent remodelling of Lahinch as Mackenzie would have wished it, or Tom Doak's work at Pasatiempo and SFGC. However, even though this is probably a good use (if properly designed and skillfully executed) , it is also an idiosyncratic one, based on the visions of the committees of those clubs, as they were constituted at that time they made the decision for retro-change.
I find all the old facts which are uncovered on this site, by people like Melvyn Morrow, Niall Carlton, Sean Tully, The Mackenzie Project, Tom MacWood, etc. to be fascinating, but I am a trivia junkie. Only a small percentage of them actually has any influence on the enjoyment of the golf courses which I play. For example, to know that such a hole as "Sandy Parlour" at Deal once existed, and to be able to locate it even today, is a cool fact, like seeing a plaque in London saying that "This was the spot of Sid Vicious' first public puke." But, I've been by Sandy Parlour 5-10 times (mostly recently) and nobody I have played with there has ever tried to convince me why that lost hole deserved anything more than a tip of the hat in passing.
Or to put it more bluntly, Tom:
Who cares who designed Merion or Myopia or Cruden Bay and if so, why?
Ricardo