Tom and I had two independent conversations with Andy Karff of Philmont. He said that Bob Labbance found a box containing early minutes and though architects are not mentioned it will help formulate the timeline.
An interesting wrinkle is that Wilson (and likely Flynn) remodeled the 10th and 11th holes on the South Course as described in an article in the Phila Public Ledger. We'll get a copy of that sometime in October and that should be interesting.
Here's what is on the table as of now:
1908: 9 holes open for play by Reid, the head professional
1916: 18 holes in play, I don't know who is credited with this. I'm not sure if Reid was around then, I think he left as professional in 1911. Tom MacWood seemed to know, I hope he will present the evidence.
In 1918 the Jackson Farm was purchased giving the club land to build the new 18 holes. Some of the holes (1,2,9, 10 and 18) were in old forest, the remainder were built in the open fields of Jackson Farm.
There is a photo, I believe on the 9th tee of Henry Strouse (board member), Alex Davis (superintendent) and William Gordon. Gordon did work for Willie Park, Jr. for a time but I think as of 1922 he was with Flynn. It may be that Gordon was the project supervisor for Flynn's designs and doing the work under Toomey and Flynn, Contracting Engineers.
What did Park do, if anything? What can we say with certainty that Flynn did? At this point I don't believe we have enough information except to make educated guesses.
When Bob Labbance returns to Philadelphia in October, I bet we'll know a lot more.
Interestingly, Andy Karff, who was away at GAP meetings got back and he had 19 different emails and voicemails from members and friends that mentioned the Philmont thread on GCA.