I agree with Barry on Alma.
I personally think Alma's note to Mengelberg, I believe, about the order of the movements of the 6th to be quite valid. Much discussion on the issue of course, but along with Tennstedt, I find the slow movement 3rd makes emotional sense.
And Alma did keep the manuscript and allow the 10th facsimile of 1924, and her response to the Cooke/Goldschmidt BBC program on the 10th shows real response to the greatness of the music, late in life, and she encouraged its performance after that.
A very remarkable woman in many ways. She must have been one of the most fascinating women of the era.
Tom in Vermont