I agree with you there on Blackwell. I have been listening to Don's BNs a ton the past week, and it is somewhat incomprehensible (to my feeble mind, anyway) some of the shit he's playing on those dates. It goes above and beyond even "driving a band," to another level of musicianship entirely. Don can certainly empathise with it, to a level of "complete communion," though certainly his cohorts on the dates fare very well in this regard also.
Symphony for Improvisers is particularly interesting, in how a large ensemble and Blackwell work together. I can't tap my fingers that fast!