A friend once explained why Robbie Flower, great player that he was, wouldn't necessarily become a good coach.
Robbie addressing a player prior to big match at the G
"OK son, when you get your chance take a mark over the pack on half-back, play on, out run their quickest player, 3 bounces (2 on your left hand, 1 on your right). Get yourself into a bit of trouble in front of the members stand, sell the dummy, blind turn, straighten up on your non-preferred foot from the 50 and kick the goal. Understated punch of the air. Repeat"
Always thought hardworking, nuggety back pockets made the best coaches. Matthews did put that theory to rest.