When Victor Espinoza rolled through the gates of Los Alamitos racecourse on the afternoon of Saturday, July 4, he did so anticipating a quick in-and-out with few disruptions. The Triple Crown-winning jockey had two mounts, in the eighth and ninth races, neither of them hot fancies. Approaching the jocks' room, however, Espinoza paused. "There wasn't enough room for all of us," said Espinoza of the room's quarters, which had been split between Quarter Horse and Thoroughbred riders. "We were stacked in there like sardines." Events from that afternoon have played...