I'm not buying the story with Grant Green being on loan from Blue Note. Larry had not even recorded Unity yet...
I think John Patton told our fellow member that it was Larry. For me, the fact that the organist plays the Love Supreme vamp pretty much all through Go Down Moses points towards Larry.
Before Kenny Garrett played with Mel Lewis, he toured for three years with Mercer Ellington -- rather than enroll at Berklee, which was his original plan.
Rickey Woodard played with Ray Charles in the '80s.
Cecil (and Ron) Bridgewater played with Thad and Mel in the '70s. For that matter, Dee Dee. Bridgewater also sang with Thad and Mel in the early '70s.
I saw a reference earlier in this thread to Branford Marsalis and Conrad Herwig playing with Clark Terry in the '70s. Actually, that band formed in 1980 or 81 as I recall -- I heard them in Fort Wayne, Indiana at a high school jazz festival in spring 1981. Branford played alto. Others in that band included Conrad Herwing on trombone, Bryon Stripling on trumpet, John Campbell on piano. Veteran Chris Woods was a featured soloist on alto.
Clayton Cameron and Suggie Otis and played with Gerald Wilson in the '80s.
John Clayton played with Basie in the '70s and Gerald Wilson in the 1980s.
Anthony Wilson started playing with Gerald Wilson in the late '80s.
George Mraz played with Thad and Mel in the '70s.
Gary Smulyan played baritone saxophone with Woddy Herman c. 1979.
Jim Snidero played with Toshiko in the mid 80s.
Jeff Ballard played with Ray Charles in the late '80s.
Jim McNeely played with Thad and Mel in the late '70s.
Dick Oats and Rich Perry started with Thad and Mel in the late '70s and are still with the Vanguard Jazz Orchestra.
Tom Harrell, Kenny Berger, David Berger, Claudio Roditi, Bob Mintzer, and Gregory Herbert all played with Chuck Israel's National Jazz Ensemble in the '70s.
Jack Walrath played with Ray Charles in the early '70s.