I don't really think they thought as deeply about greens contours as some here think. Especially since it was hard for them to actually see most of them built, and in many cases, they were built by relatively amateur constructors, fulfilling the saying about using inexperienced or drunk shapers.....
Indeed, what many here are crediting to the architects and Jeff credits to "shapers" is really what we call "finish work". In the old days, it would have been quite rare for the architect himself to be around at that stage of construction, just prior to the greens being seeded. The work was usually done by hand by the construction crew, and whether there is more or less "micro-contouring" is the provenance of the construction foreman.
Generally, the surface drainage of the green would have been specified and/or supervised by the architect during the shaping phase, and these micro-contours were not supposed to override the surface drainage ... i.e. the slope might be a steady 3% or go from 4% to 2% to 3% to 1%, but it didn't go to negative 1%, or there would be a puddle in the green, except on the sandiest of sites where small bird-baths are sometimes possible. But I do think this unevenness was a part of the construction and not a result of subsequent "settling". I know my own greens contours have changed over the years from topdressing [and from the wind "topdressing" greens out of bunkers], but I can only think of one instance where part of a green has settled. It just isn't that common.
Today's architects have somewhat different preferences. A few [like Bill Coore] float out every green themselves, so any micro-contours are their doing, but in general I don't think Bill is trying to add contour when he floats his greens. [I've never asked him about that; I really should.] Many other architects rely on contractors, who generally try to make a 2.5% slope a perfect 2.5% from one end to the other, in order to display their precision. I actually leave a lot of my finish work to my associates, so it will differ some from course to course, but we are aiming for something in-between lots of micro-contour and none at all. I'm guessing that's about how Donald Ross did it, too.
P.S. to Jeff: Have you ever read any famous dead architect's instructions to make their greens drain in 2-3 directions? Many did, of course, but a lot of their greens also drained in one direction. I thought the "three directions" was more of a modern concept, and can't think where I have seen it in any of the old books. I do agree with you about greens draining toward the mountain, though ... on the outside edge of the green that would be fine, but on the inside edge there would need to be an obvious swale for the green to drain into.