David,
What you don't understand about the Flynn article quoted in the Oct 1927 Green Section Bulletin is the context of the article.
You're reading it with a biased mindset that
Flynn's "cape" hole concept had something to do with the green.
It did not.
It had to do solely with the tee shot.
It was NOT associated with a green jutting into a body of water nor was it associated with the green surrounded on 3 sides by topographical features or hazards.
When you wrote in your initial post,
"The "cape-type" hole was one of the fundamental holes he thought should generally exist on an 18 hole golf course."
You're misinterpreting his concept and understanding of HIS "Cape" hole.
Flynn talked about various types of holes that should make up the average good golf course. Nowhere does he write that a cape hole should generally exist on an 18-hole golf course, that's speculation.
Nowhere in the Cape Hole quote does Flynn mention the green.
He talks about the tee shot when he says,
"When a test of length off the tee is presented the best type is the cape or elbow where it takes a really big tee shot past a corner to permit reaching the green in par."
Flynn's concept of a cape hole is where the hole turns in an gradual elbow or sharper. Nowhere in the entire article does he discuss a "cape" green.
You are NOT accurately reflecting Flynn's definition.
You're inserting your interpretation to support your flawed premise. The old square peg in the round hole strategy.
The 10th at Merion, as EVERYBODY understands it, does NOT test the tee shot in the definition Flynn uses, nor is it at all similar to the 14th at NGLA.
The inspiration for, or the concept attribution given to CBM by you is not based on reality, it's wishful thinking.
If you view the current 10th, play the current 10th repetitively, the prefered method of play is away from the green, away from the diagonals, toward the right side of the fairway.
Only recently, due to hi-tech advances, has carrying the green on a fly or carrying it into the fronting bunker been a potential option.
That's one of the reasons that CBM lengthened the 14th at NGLA, he feared that advancements in equipment and/or the golfer's skills would bring the green within range of the long hitters, destroying the strategy, and he wanted to preserve the angles of attack and the approach distances to the green such that they continued to provide the challenge he originally conceived, designed and cosntructed.
# 10 at Merion calls for a relatively straight drive, while # 14 at NGLA calls for a diagonal drive, relative to the line between the tee and green.
Was the 11th at Merion a CBM inspired cape as well ?
The 15th ?