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I haven't seen Finegan's book so I can't comment on his timeline. I'm sure he has been exposed to hell of a lot more info than I have. What little I know is based on articles written at the time or shortly after. Based on those articles I stumbled across few interesting discoveries:
At the time of Colt's visit (6/1913) Crump had the first seven holes roughed out. The first and second are the same, the 3rd was par-3 of 185-200 yards to an 'Alpanized' green guarded by an 'elaborate variation of the Mid-surrey mounds.' The 4th is not described well, but I assume it is the same. The 5th was shortish par-3 over a creek. The sixth was a par-5 and the 7th was less developed. It involved a well placed drive over an 'enormous dip through which a flows a stream'. the second shot was a mashie (8-iron). The reamining holes were more or less in Crump's head, including the 18th a longish two shotter over a water hazard.
By December 1914 eleven holes were completed and the entire routing was solidified. The course was 6700 yards.
1, 4, 6, 9, 13, 16 and 18 were long par-4s.
2, 11, 12 and 17 were medium length par-4s.
7, 8, 14 and 15 required short approaches (par-4s and par-5s)
3, 10 and 5 were par-3s.
Tillinghast wrote "much has been written concerning the marvelously fine course, discovered by that celeabrated golf architect, Mr.H.S.Colt....a fortnight ago the writer had the pleasure of walking over the undeveloped seven holes, and in his opinion theyu are the greatest of any, and Mr.Crump agrees with me in this opinion."
By March 15, 1915 Crump has discovered the current 13th and 14th.
The last holes constructed were 12-15.
I have no idea if Colt and Crump communicated between his visit and Crumps death. One of Colt's most treasured possessions was book of phots of PVGC. Following Crumps death Colt sent Alison back to PVGC for further advice.
I wish I knew more.
On the subject of Colt and Alison, for the most part they worked seperately. The many courses in the US built between 1920-1929 are Alison's, as are the Japanese courses. Colt had an equally impressive list of accomplishement in the UK & Europe during the same period. And their styles were quite distinctive. One of the reason's Colt's attributions are fuzzier than other architects is because there are very few of his plans remaining. His biographer had never discovered a single plan. He claimed he made scale models early on, but mostly worked like Pete Dye rough plans and doing much of his design work in the field with experienced help. (Many of these architects produced buitiful plans as much to promte the project as anything, and I don't feel Colt felt the need to promote, in fact his lack or promotional skills may hve also contributed to his limited fame.) That is why the PV plans are so entruiging, they are rarities.
Alison on the other hand drew detailed plans.