I'd say that the swing feel (the use of dynamics, that pulse that Chico has and the fact that he is either never soloing or always soloing) and the general exploratory direction of these groups in the Hamilton Mosaic is really his leadership signature. All his groups forward had a "fusion" aspect to them---not necessarily of rock music alone, but of classical chamber music, etc. I truly like his groups, and usually I found that another musician in the group gave the music a direction, for example in the PJ material the cellist, in the Columbia and Impulse Charles Lloyd as music director, in his most recent groups I think the guitarist, etc. This is not unlike the way that Golson and Shorter and Walton and others shaped the direction and signature of the Blakey groups.