In general Cork's use of the ball was incredible. Nash's puckouts were incredible, he was pretty much placing it into the hand of one of his half forwards every time.
Cork's midfield always had the head up, looking to find one of their forwards who themselves were always on the move looking to receive the ball. It more or less by passed the sweeper completely, as it insured there were very few breaking balls to mop up.
By contrast, Waterford were completely without any plan in attack and regularly took on Hail Mary shots from out the field. Because they had an extra man back, whenever it did go inside their forwards were completely isolated.