Oddball/fantasy answer: Winston Monwabisi 'Mankunku' Ngozi, circa 1967 Yakhal' Inkomo. I think it would have inspired the group in a new direction. I'm not fond of the term or notion "world music", but Mankunku did do a nice job blending Trane, Shepp, (maybe) Tubby Hayes and others with some South African influences. He would have been a bit young to actually work with Miles during the "interim" period, but Miles certainly had some young 'uns in his bands.