I think your statements here are quite true. I got from my correspondence with AG as well as the text a sense both of appreciation for the work and what might be disappointment for what wasn't working.
They represent a very good record of MW's teachings and also offer an honest perspective of one of his students. By the time I studied with Arnold he was far removed from Minor's teaching practices, but he would speak at times of the strengths and weaknesses of the methods.
I had an intuitive sense of this very thing, at the time, and I know that it, among other factors, contributed to my declining the invitation to go with MW to MIT and live in the Arlington house. Then I went on and made my own mistakes.
I do recall AG warning all of us about the risks of following a charismatic leader, encouraging us to find our own paths. I see now how that applies to life beyond photography, although I wasn't thinking about that then.