It should also be noted that, apart from the concept that kikuyu grass is good for polo fields, on account of it's virtual indestructablility, the grass was also imported as a means to stabilize the barranca wall. Prior to the Army Corps installation of the "underground river," the sides of the barranca were subject to massive erosion during rain events, and kikuyu was thought to be able to withstand these forces. Obviously, though, this type of grass is one of the most vicious invasives known to the turf world, and subsequently spread to the bulk of the golf course grounds.
I used to work at Riviera and I remember one time when we were transporting some sod from one area of the course to another after the tournament was gone. We cut a bunch one afternoon, but did not finish moving it all that afternoon. We came back the next day, and it had already re-rooted itself!
As far as the golf course itself, it is one of the most special places in all the world. Much of the recent work is not being done with any historical relevance (e.g., there is no evidence to support the bold alteration of bunker and green complex on the 17th hole), but this does not destroy the character of the golf course, at least in my mind. I do wish, however, that they would come to a conclusion with respect to the end product of all of their current work. It still seems a bit piecemeal to me.