True, Zephyr were jazzier, that was the Hammond player in part, but Bolin could easily slip in a jazz mode too. It explained why he would end up on Billy Cobham and Alphonse Mouzon albums, and of course his own failed Energy project was an attempt of cracking the early 7Oies jazz rock market in the wake of the Mahavishnu Orchestra too. When Bolin's guitar playing got frenzied, it always reminded me of Be Bop Jazz, think Charlie Parker.