David--
I don't suppose we know for certain--fair enough. All I can say for sure is that they're 18 of the most challengingly, confoundingly excellent green complexes I've had the fortune to traverse in my--short, though thankfully fairly varied--golfing career.
If I recall correctly, I read that Ross offered to change them sometime in the 40s, but the owner refused, arguing that they'd ended up fine. It would appear that the question now becomes the following: how much better could they have ended up from today's perspective if Ross had had the chance to overhaul them back in the day? No one knows the answer, obviously, but I personally am not sure they'd be better today if he'd been allowed to change them as drastically as it seemed he wanted to.