Alex
You may be right about the 12th. That hole does look a little bit like a Biarritz...though the bunkering is not exactly prototypical. It is also steeply uphill, and though my experience is somewhat limited, I've not known Raynor to do that. Are there other Biarritz that are uphill?
In George's book he lists Greenwich as a redesign in 1915-16. If that is the case its very unlikely that 4/1915 map/routing is Raynor's.
C&W lists Greenwich as an original Raynor design, but doesn't give a year. They claim Robert White redesigned two holes in 1925, and those two newer holes at the far end of the property look to be in a different style. They claim Ross redesigned the course in 1946, and I'm not sure about that. Ross had been, more or less, retired for over decade in 1946, and with the war I can't imagine anything major taking place. Then we have two newspaper reports from early 1916, that Greenwich has just asked CBM to critique their course. And then the newspaper report from the latter part of 1916 that John Reid, Henry Topping, et al., are tweaking the course by adding approximately forty new bunkers.
Who did what and when is still up in the air.