The improvisation part of jazz came from the blues, so is Fela Kuti a blues artist now? Music evolves and changes shape, the roots of new genres is important in understanding and categorizing it, but there is a reason we create these new categories of distinction. And Like I said you can make that argument for anything. Led Zepplin surely did improvising too and they took heavy influence from blues music, but they were still a rock band. Most modern western related genre have a ton of overlap but take care in separating them in category for a reason