While one reads often of the exploits of harness racing wonder Mack Lobell, 3, 1:52.1 ($3,917,594), it’s not often that aficionados of the sport reflect upon the lasting impact of his sire, Mystic Park 3, 1:57 ($480,907). The son of Noble Gesture-Mystic Sign-Speedster, while best remembered as the horse who sired “Mighty Mack,” was himself,