David Hofmans marches to his own drummer, and the beat is always double time. On any given morning at Santa Anita, the 73-year-old Hofmans and his 34-year-old nephew, Brent Fabbri, his assistant for 15 years, are in lockstep, David at 5-11 and Brent at 6-2, bald pates gleaming in the Southern California sun, as they march to a lookout point on the grandstand steps to watch their horses work.