LOUISVILLE, Ky. - There once was a well-worn path to the Kentucky Derby. A horse had to get plenty of experience at 2, have a slight vacation, then prep in several races at 3, culminating in a race like the Wood Memorial or Blue Grass Stakes, then head straight to Churchill Downs for as much training as possible over that surface. Get used to the track, get used to the surroundings, get a slice of Derby pie, the thinking went.