Seldon Powell was not that obscure when the album came out back in 1956 (Clifford Brown's death is not mentioned yet in the liner notes). He was one of the tenor hopefuls at the time.
The other tenors mentioned are Stitt, Rollins, Getz, Gray, Heath, Rouse, Foster, Eager, J.R. Monterose, Mobley, Coltrane, Gordon and Urso.
Not really a chart but just a table which appears beneath the liner notes. Gitler mentions that lack of space prevented him from including 'Pres' disciples (Sims, Cohn) and their little brothers (Perkins, Kamuca).