pjw, thanks for the clip. Great stuff. He does a great job of explaining the harmonic details of the tune. I applaud your inquisitiveness about all this; it all adds a great deal to the appreciation and enjoyment of the music. There are so many different layers to this music and the experience of listening to it.
I think that James’s organ/drums duo does more than play the tune “adequately”. They are really good rhythm players. It’s all a matter of degree. Do I think they are as swinging and nuanced as some others? No; but they are certainly good. Just my opinions. Check out Peter Erskine on the Brecker/Mintzer clip. Amazing.
You write that in that Flanagan and Taylor were replaced on two songs, GS and Naima. I don’t know about Taylor, but Flanagan’s performance on GS is the stuff of Jazz lore, but not in a good way. He really struggled with the tune’s changes, is very tentative and actually stops improvising and just comps for the last several bars. He just could not cut it. Much has been written about all this. Playing over changes that intricate and FAST was something that even the best players at the time were not used to and some were never able to do it. Some didn’t even try. I don’t know the dates of those alternate takes, but if they are from a later date (even just a day or so) then the reason for the change is pretty obvious.
Trane practiced incessantly and worked on all these harmony techniques methodically in order to expand his musical vocabulary. None of it happened by accident. He was always searching for new sounds and new techniques and hanging with Monk, being the great individualist that he was, was probably very appealing to Trane. It’s interesting to me that, in a way, there is a similarity to both of their general rhythmic feels. Not what could typically be called smooth and laid back, but a little angular even jagged instead. Great question, btw. Regards.