Tom H. -
Since I have never have competed (and never will!) at a high level of amateur golf, I don't know what the practice & preparation habits of the top players are. However, with this being the top amateur event on the West Coast and a possible Walker Cup spot on the line, I would think most of the entrants would want to play as well in the event as they possibly can.
To the best of my knowledge, both OC courses were available for practice rounds on Sunday & Monday. I would have thought that most out-of-town contestants would have arrived in the Bay Area this past Saturday or Sunday and made some attempt to play (or survey) one or both of the courses.
Heck, the one year the Presidio GC won the NCGA Saturday Team League, we went down to San Luis Obispo GC a day early to get in a practice round on their course for our semi-final match!
Since young Mr. Liaw soon is turning pro soon, he may very well have other priorities at this point. I have no problem with that.
DT