That book takes too many twists and turns, conveniently putting in a "must have known" or "surely knew" or "likely was" every time there is a key point to be PROVEN, which is a sure sign of lack of evidence. I destroyed Robert Stinnett's wook---without knowing a shred of decryption information---simply by showing that at every single point where he had to "prove" something, he relied on "mush language" to make his case. Again, conservatives are better off attacking Roosevelt for his real crimes, not conspiracy stuff.
. . . and it's certainly not as if those had not been sufficient in themselves!