I had the opportunity to play under the baton of GS for several years in the 1990s - in the Mingus Epitaph Orchestra and the Smithsonian Jazz Masterworks Orchestra. Notwithstanding all respects and courtesies due, etc...., there were any number of trying, one could say incredulous, sometimes pathetically hilarious moments. It was instructive to witness how many of the elder statesmen just rolled with it seemingly unperturbed - Eddie Bert, Britt Woodman, Joe Wilder, Buster Cooper, George Adams, Joe Temperley, Don Butterfield...
But just one case in point:
In one of the Epitaph movements, my part began with five bars of rests per stave all the way down the page. In the first rehearsal I'm counting my ass off making sure I don't get lost. As I'm counting I'm listening to the orchestra expecting to hear something having to do with five bar phrases. All kinds of polyphony going on. After a while without success I give up counting altogether and just listen. Sure as shit it's just a goddamn twelve bar blues!