I've found Ronnie Ball's playing often interesting. There's the audible Tristano influence, especially on the Savoy date with Ted Brown and Willie Dennis, but also something else. Can't quite pin it down, but it is there.
Steve Colson has led some fine bands (hear NO RESERVATION on Black Saint) and contributed fine work to a number of relatively overlooked recordings (Bright Moments, RETURN OF THE LOST TRIBE; Oliver Lake's MY FRIEND LOUIS; Andrew Cyrille's ODE TO THE LIVING TREE).
John Dennis -- not a lot to hear, but what exists is some pretty advanced, Tatum-derived stuff