Haven’t searched my database lately (or updated it), but I will estimate:
Definite top:
Evan Parker: total about 145 - 150, probably half as leader/coleader, rest as sideman
Anthony Braxton: about 125 or more, probably 75% as leader
William Parker, more than 100, probably less than 125; most as sideman
Then there’s a group around 60 – 70, mostly as leaders (Ra and Taylor aren’t frequent guests!):
Sun Ra
Cecil Taylor
Derek Bailey
Charles Mingus
T. Monk
John Coltrane
Peter Brotzmann
Han Bennink (few as leader)
Below that, a bunch with around 30 or more:
Joe McPhee
Ornette Coleman
Zorn
A v Schlippenbach
John Stevens
As for how much of it is still sealed – quite a few but there isn’t anything I haven’t heard. Many are things I’ve heard elsewhere and decided I want to own for future. Right now, I’ve got more $$ than time, so I look at the shelves as a retirement project.