with all that overlapping, it's clear they knew each other's playing - and what Kaye says about Whitby is very much what I said earlier:
"In the opinion of the author, the solos demonstrate an almost complete independence of the major saxophone influence of the time, Coleman Hawkins, and followers like Chu Berry. Lester Young had not yet made his impact on the Tenor sax scene. Paradoxically, given his origin, Francis's playing was the antithesis of the hard-driving, gutty, bluesy, South-Western style of tenor sax playing, as exemplified by Herschel Evans, Buddy Tate, and others. If anything, Whitby's tone and attack were light and airy, more like an alto saxophone."
thanks for copying those sections. Interesting stuff. There's no way of telling who was moving in that direction first. The alto comparison was also sometimes made with Prez.