Brent:
I disagree with that analysis; you are taking it to extremes, and yes, at those it can fall apart. I also never said Crenshaw's ability disappears. We're also not talking punchbowls. We're talking flattish greens (think basic muni here in CA, if you can), v. say Ballyneal at great speed (or say, another course with wild contours - Pasatiempo works.
My thinking is that at course A (flat): Crenshaw makes darn near every putt he reasonably can. Hard to put this into numbers, as it's so going to change on length of putt... but he does not miss many, if any, straight putts of a reasonable distance. Compare that to the average schmoe putter - he doesn't make many at all on the flat greens. Large advantage for Crenshaw here.
Then put them on course B: on those, Crenshaw two-putts a lot of putts he would otherwise make. He also three-putts from time to time. Meanwhile average schmoe just continues to miss the medium length putts he missed anyway on the flat (so no change at all for him, two putts equals two putts), and I really don't think that he 3 or 4 putts enough to overcome this.... So Crenshaw's effective advantage, in terms of putts taken, is less. His skill doesn't disappear - oh far from it, he sure comes closer on those medium length putts than Schmoe - but he misses enough such that the advantage lessens. They each take two putts there, whereas it would have been 1 for Ben, 2 for Schmoe on the flat greens.
Does that make better sense? We're not talking punchbowls. We're talking flat greens v. contoured ones.
In any case, you are a VERY smart man and I shall trust your take for sure. To me it's pretty simple logic however that it works as I say. Only if you think the average schmoe is gonna 4 putt a lot does my analysis fail... and I just don't think that's gonna happen.
TH