I don't even remember what I posted above that is now unavailable on YT, but someone put up the "Epitaph, Live 1969" recordings, and I finally got a chance to hear Ian McDonald' sax playing, and just like Chris Albertson's DB review said back in 1970, IM, indeed does sound like a John Handy/Eric Dolphy- influenced player. Not only that, but he sounds fantastic!
This explains why Fripp started crying when Michael Giles and IM told him in SF that they were quitting the band, and Fripp's offer to quit the band if they would stay in the band! This was verified by two commenters on the YT video I'm about to post, who said that the public version of why IM quit the band (hated touring) was not the real reason why he quit KC; it was Fripp's playing that was driving him insane! IM said that he wanted to play happier sounding music than the deafening, dark music that Fripp wanted to push the band to play. This was verified by a documentary on KC in which IM made those comments. Whether Giles felt the same way, is unknown, but he had the same hatred of touring that IM said he had. If IM hated touring so much, why did he help form the horrible Foreigner soon afterwards? They toured even more than KC. The obvious reason was for the money.
All of that doesn't explain why Ian never played jazz alto on any sideman record dates that I'm aware of. Unlike Dick Morrissey, who played in IF and The Morrissey/ Mullen Band, DM still played a ton of jazz dates also. But when I look at Ian's sideman credits on All-Music, they're all for fusion and or rock bands, none for jazz groups. Even when he released his only album as a leader, "Drivers Eyes" there was none of the incredible alto playing that he did on this:
https://www.youtube.com/watch?v=Pi8x9OsJnEY&list=PLXhfRoiJBIisO5XAgsF3Ah9BXbJbsr-yk
They do a full blown jazz performance on cut #13 of the concert, with Lake walking and doing his own version of 'jazz' singing on the song, and the next cut "A Man, A City".
I'm going to check out Judy Dyble's "Harpsong" from "Talking With Strangers", and see what he did with The 21st Cetury Schizoid Band", to see if he did anything other than I Talk To the Wind on flute. If you can think of any other recordings he did on alto sax, please let me know!