I'm a big fan of all of them, too, but I a little skeptical that
this combination would have worked. I hate to call McCartney a "weak
link", but his forte is as a songwriter and singer. As great as his
bass playing is, I don't think of him as being a strong improviser,
like Hendrix, Davis, and Williams. But maybe I'm looking at it
backwards. Jimi certainly had a pop song sensibility. Williams was
an experienced session drummer and he could play just about
anything, not just the "power jazz he was known for. Miles was
capable of writing beautiful melodies and had great lyricism in his
playing, so maybe he would have adopted more of a pop song stance
for this project.
The possibilities are fascinating.