Gunther is spot on. Coz is a fine example.
Just consider how many Cabs became instructors and went on to influence a couple of generations of drum corps participants. (D'Amico, Angelica, Hayes, Rodriguez,...et al.)
The success and renown of the corps from which they emerged, due in large part to Jimmy's guidance, provided them the street credibility to be "influencers" in their own right.