Chris, I think it is a little unfair to compare RMGC, which comprises two courses, to KH, which only has the one layout.
This is reflected by your scoreline of 10 up to the Black Rock establishment. Best to compare the West Course RMGC to KH; then we experience the sweaty palm syndrome coming down the stretch: the match is alive and up for grabs. For my money, RM West wins by a narrow squeak, around 2/1.
The Composite Course doesn't actually exist as a bone fide enntity; it is a contriveance - albeit, a magnificent one - to meet a series of predetermined goals: tourney's, ease of traffic, prestige. It is not a golf course!
In a peverse way, the configuration known as the Composite Course, harms RMGC dearly with course ranking judges. Its true place in world rankings (possibly between 3-5) is downgraded becuase judges identify with the makeshift layout, not the individual ones.