Tom,
I don't understand the characterizations?
By your own very Barker-biased list the very top courses of the time in the US were all either totally or heavily designed by amateurs who usually belonged to the clubs involved.
We've already gone through the documentation about Crump, and a lot of his routing was done before Colt's arrival and much changed after his departure. Your continued mis-characterization of that situation belies true history.
Most of the courses in Philadelphia in 1910 or thereabouts had a strong amateur influence or design. Philly Cricket was mostly Samuel Heebner, Herman Strouse was already highly involved in Philmont, Tillinghast and Klaudner were building a new course for Aronimink, George Fowle had designed most of the Philly Country Club and soon had revisions by E.K. Bispham, Ab Smith at Huntingdon Valley, Heebner and Thomas at Whitemarsh and so on.
The very early Philly courses by pros were done mostly by John Reid, Willie Campbell, a very few by Findlay (he didn't live there yet), and Willie Tucker and they just were not very good and quickly proved inadequate Tom.
It is therefore no surprise at all that these amateur guys had the time, motive, and opportunity to design courses for themselves Tom and it's very well documented history. This continued through the teens and 20s as many local courses were designed by amateurs like Frank Meehan and Ed Clarey and Hugh Wilson and Herman Strouse and Ab Smith, with many as collaborative efforts, like Pine Valley and Cobb's Creek and later revisions to North Hills.
After watchiing competitive friends like Leeds and Travis and Emmet and Macdonald do the same thing for their clubs, there was no reason for these very successful men who loved the game to think they couldn't do the same thing for their own.
If it would help, I could show you the early design lineage of every prominent Philadelphia course during this time period. I would agree that beginning somewhere around 1910 til WWI or so some more pros were beginning to be brought in, primarily Donald Ross, but both amateur and pro design motifs co-existed well into the 20s in the region, with the major pros post-war being Flynn, and Ross, with surprisingly little Tilly, who was off making a name for himself in other cities.
I'm not sure why you want to deny this well-documented history Tom. You should really have read many of the articles Joe Bausch produced here over the past three years in this regard, Tom...it's been absolutely stellar stuff that makes it all very clear.
Whatever work early pros like Barker did near Philly for clubs like Springhaven and Atlantic City didn't last long, and was never much heralded locally.