In my own case, and following the books of these scholars, I produced a study in 1997 that examined the methodologies used to produce casualty estimates from the Enlightenment and American Revolution through World War II.
It included precisely what was estimated as the Pacific war came to its bloody conclusion, and a sort-of “who knew what-when” for Truman and his senior advisors.
Oddly, such a thing had not been produced before by a military historian, apparently because everyone alive when the war ended understood that a land invasion of Japan would have generated enormous casualties. No one had suspected that this was something that would later be seriously questioned.
Said Dr. Michael DeBakey who put one of his students to work helping me locate certain documents: “It’s like having to prove that slamming someone’s head with a meat axe will kill him.”