ARTWORK: Duffy's Coaching Legacy tree reflects assistant coaches who changed the face of college football integration. First branch, top to bottom, Sonny Grandelius, Frank Kush, Dan Devine. Second branch, Earle Edwards, Bob Devaney; Third branch, Chuck Fairbanks, Bill Yeoman; Fourth branch, Tyrone Willingham, Jimmy Raye; Sherman Lewis. Other Duffy assistants who became head coaches in college or the NFL were Vince Carillot, Denny Stolz, George Perles, Hank Bullough, Cal Stoll, John McVay, Dave Smith, Wayne Fontes and Woody…