Frogman, I remember the first time I heard "Speak Low" by Sonny Clark. I was on a date in a night club when I heard this music emanating from the jukebox. It had been one of my favorite tunes for some time, but I never heard it played so well. At that time I couldn't identify the musicians, but I knew this was the best tenor sax solo I had ever heard to play that tune.
Of course we now know it was John Coltrane. Yes, he advanced from the time that came out till the clip you posted, but he could not have played that solo on "Speak Low" any better.
After I learned the personnel on that record, I realized why it was the best I had ever heard; it features Donald Byrd, Curtis Fuller, John Coltrane, Paul Chambers, and Art Taylor. It was Released Mid March 1958, Recorded September 1, 1957 Van Gelder Studio, Hackensack, plus that LP also had Rudy's stamp of excellence on it.
You gave a perfect description of Bobby Hutcherson's vibes.
Enjoy the music.