Good stuff all around.
When I first read the excerpts, I figured Flynn was willing to give away his writings just for the wider circulation and thus, name recognition. I didn't know about the possible USGA designs that he would naturally want. Both would be motivations to forego book sales. I am sure the modern authors here can attest that publishers payments would be dwarfed by one big commission. And, he had to wonder if the market was tapped out for gca books, no?
While Toomey may have been harsh towards the others, I suspect since he was writing to the green section, part of his sales pitch would be that Flynn was in a unique position to offer more views on the agronomy and construction sides. I think all the others pretty well laid out their gca philosophies, but were at least a little light in the tech issues, at least from my readings of the book. So, Flynn was going to, IMHO, address the weaknesses of those other books.