Wayne Gretsky, Isiah Thomas, Magic Johnson, and Pete Rose. Each was phenomenally successful at scoring goals, points, or runs in their respective sports. Coaching others to do the same? Not so successful.
Bill Belichick, Pat Riley, Bobby Cox and Tony La Russa. Polar opposites to the previous four athletes.
"What's your point?" you ask.
Business people, like athletes, don't have to be great players to be great coaches and vice versa. However, great coaches can bring out the best in others.