Ah, I wasn't familiar with the foot/ankle pain story, Jim. What a true shame...
As for the Jimi/Prince thing, it's as tiring an argument as Parker/Dolphy. Who did it better? Who cares? Did the latter emulate the former to a certain degree? Yeah, so what? Like that's a bad thing. All four offered their own unique voice, and all four did it to an astonishing degree.
Enjoy it, or don't.