I think the real question is how much was Thomas influenced by Macdonald and Raynor? There are lots of their elements all over Riviera. Not verbatim templates, but elements that Thomas took and did his thing with.
#1 Is this green influenced by the Lion's Mouth?
#4 Is this the first version of a Redan on the West Coast?
#5 Is the man-made hill that guards the right side of the green and the big kicker a tribute to The Alps?
#6 If you pull the bunker in the middle of the green straight forward to the front, does it become The Strath? Left side has a stand-in for The Hill and a severe back to front slope. The right side, with the bunker in the middle, becomes a Punchbowl. So is this an Eden or might it actually be a Short with its 3 distinct pinning areas?
#7 Hogsback fairway.
#8 Thomas' par4 version of The Channel Hole?
#10 Leven?
#13 Cape, before the left trees were subsequently planted.
#14 I had never understood this hole. It always seemed like it was a throwaway hole, just a bad day for Thomas/Bell. It did have this majestic setting, sort of set in a gallery of trees - very presentational, but why? A friend who is very well versed in Mac/Raynor was playing there with me not long ago and after listening to my theories all day looked at this hole and said "Well, this is actually The Eden." Big Hill bunker on the left, wide and narrow green, front right bunker starts at the approximate placement of the Strath. Not a duplicate, but inspired by and given one of the prettiest settings at Riviera. Very grand presentation as it reveals itself to you on the walk from 13. Fitting for what was still considered the Best 1 Shot hole in the game at that time.
#15 Biarritz green spun and placed on a diagonal, and used on a par 4.
#17 Long with Hell Bunker off the tee instead of the 2nd shot.
#18 Sahara-like tee shot.
I pitched all this to a renowned Architect last summer and he accused me of seeing Jesus everywhere. I think I was finally seeing Thomas being influenced by the Father of Golf Architecture in America.