Tony,
I have played Misquamicit a ton over the past twenty years and have always thought Raynor had a hand in the course, but never heard anyone even state he was there, much less as an actual fact. Do they have records?
If he really did work there, and only did five holes, I would go with the holes he did as number 6-Reverse Redan (maybe with green contours tweaked by Ross ), 8 - Short, 9 -Knoll?, 10- Alps, and possibly 18 as a Biarritz that had the green changed by Ross ( total guess on my part thinking the back bunker could have been the swale) or more likely, Hole 1 - Punchbowl.
I personally never had a thought that 17 was a Road Hole. Even after you point it out I am not sure I see that.
Cool article about a cool course though! The Travis angle is interesting too.