LOUISVILLE, Ky. - With the legendary D. Wayne Lukas, white cowboy hat, shades and all, leading the charge aboard his stable pony, Thursday's exclusive 15-minute training session for GI Kentucky Derby and GI Kentucky Oaks entrants was off and running on another partly cloudy and warm, humid morning at Churchill Downs. The 89-year-old, four-time Kentucky Derby-winning trainer was accompanying Virginia Derby hero American Promise (Justify), who will become his 51st starter in Saturday's Run for the Roses. Doesn't get much better than that. Flying Mohawk (Karakontie {Jpn}), an enticing 30-1...