Jack Elway, son of the Denver Broncos Hall of Fame quarterback, is competing for the same position at Cherry Creek High School, where he is a junior. (Post / John Leyba) Greenwood Village - He wears No. 7. Of course. He gave serious consideration to selecting another jersey number and playing linebacker instead of quarterback. But John Albert Elway III is not sidestepping the shadow cast by his NFL Hall of Fame father. On the eve of opening practice for the state's 86th high-school football season, the blond-haired kid Coloradans watched grow up through Broncos training camps, in sideline...