Tom MacW -
As between MacK and Behr I think there was a fair amount of borrowing back and forth.
MacK preceded him in the business, was older and always had a bigger reputation than Behr. Heck, MacK had already published a book on gca at about the same time Behr was just starting out in the business.
But it wasn't entirely a one way street. I think MacK appreciated Behr's radicalism. (And Behr appreciated MacK's.) Behr's notion of a bunkerless course, like the one he built at Rancho Sante Fe, was a precursor of sorts for MacK's minimal bunkers at ANGC. MacK called Lakeside one of the great courses in the world.
Behr's emphasis on using existing contours and the centrality of landforms and contours in great designs might have been something that MAcK ended up stressing in S of SA more than he otherwise might have because of Behr. Certainly that idea was at the heart of why he thought TOC was the greatest course in the world.
The larger Behr influence, however, was in shaping the response of the strategic school to the challenges posed by Crane. Crane promoted tougher, more penal golf courses. He urged more severe tests of golf skills. He thought TOC let bad golfers get away with too many bad shots. They weren't penalized enough for his tastes.
Behr was a first responder to Crane and in many respects the conceptual framework of his response to "penal" designs was the conceptual framwork adopted in all the great architecture books published in the Golden Age. They all borrowed, in one form or another, arguments first made by Behr. In fact, describing some designs as "penal architecture" originated with Behr. The strategic v. penal dichotomy originated with Behr.
Put differently, Behr shaped the way MacK (and Thomas, Hunter and others) described what they were doing. He helped them define the principles of strategic design by helping them define what it wasn't. The great battle MacK and others saw themselves engaged in with penal architecture was one in which the vocabulary was pretty much set by Behr. That battle, btw, was essentially a battle against ideas promulgated by Crane.
Bob