Surely Behr would have been made aware of MacKenzie's views much earlier. In 1915 Behr's Golf Illustrated published a transcript of MacKenzie's lecture on military entrenchments, in which MacKenzie said / wrote:
"My ideas on golf course construction, for example, have been mercilessly criticized and condemned, and it has taken me nearly ten years to persuade the public that there is anything in my views on course construction. It may be asked what earthly connection is there between golf course construction and trench making? The connection consists in the imitation of nature. The whole secret of successful course construction and concealment in trench making consists in making artificial features indistinguishable from natural ones, and for the last ten years I have been daily attempting to imitate nature."
Later, he says / writes of proper trench structure:
"Not that at point d [note: this is the apex of the parador or rear of the trench] the raised portion curves slightly downwards, forming an overhanging lip."
It would be interesting to know how this article came to Golf Illustrated. It was published in the April 1915 edition and is likely a reprint of a 6 March 1915 Country Life article.
One possibility is Bernard Darwin, though. In his February 1915 Golf Illustrated column, he references the lecture and it appears by the text he attended in person, although he does not actually write that. Interesting perhaps only to me, given Darwin's writing of the lecture in Feb 1915, it seems likely MacKenzie would have given this lecture in 1914.
This transcript, then, would be the "index" lecture, which MacKenzie later wrote of as a 1914 lecture, subsequently revised in 1915 and 1916. (And published in October 1917.)
I don't think any of this has anything to do with Wayne's question, though. These ideas are more like an echo of ideas first voiced perhaps as early as 1901, when MacKenzie wrote 2-3 pages in the Leeds Golf Club suggestion book explaining how the course could be improved.
These ideas were so well received they killed his chance at captain of that club! (Reference "15 year" comment in first MacKenzie quote above.)
On the other hand, perhaps the connection is we are explaining the diffusion of his ideas, how, how fast, and when this process occurred / began.
I say "his": it's not clear which ideas falling under the category of naturalism belonged to Mac, which belonged to Colt, and which sort of sprung forth in a dialectical, kaffee-klatsch kind of way.
I continue to like Wayne's "nature faker" term (which I know he ascribes to Flynn) as I believe MacKenzie appreciated the subjective experience of playing the course, the mental, psychological response to the "optical inputs" far more than any other designer, and I think he did it first. I'm not sure Colt got past the idea that he truly was honoring nature and taking what she gave, even as at places like St. George's Hill he totally obliterated nature.
It's a subtle difference between the two designers, one more of conception and explanation or rationalization rather than perception (although here again I think MacKenzie drew on techniques for deliberate visual deception, not simply the imitation of nature), but in my opinion it does help explain the rise of obscurantism.
I also think maybe MacKenzie's core ideas were misunderstood or distorted in some way, and these misunderstandings provided the intellectual rationale for excessive bunkering, overshaping, and ironically the clearly unnatural work of many efforts post-Second World War.
Mark