On a cloudless August morning in Goshen, Kentucky, a steady stream of horses step on and off the synthetic track at Skylight Training Center. It's a tranquil, scenic drive along Liberty Road to get to Skylight, and quiet still upon pulling into the training center's drive. But at a barn towards the far end of the property, there's a certain effervescence at Tom Drury's stable. The magnetic energy is palpable even in watching the staff go about their daily tasks. "It's a lot busier around here lately," Drury said with...