LEXINGTON, Ky. - If the odds are against the little guy in racing, you'd never know it by looking at the breeders of this year's Kentucky Derby contenders. In a game dominated by the vast stables of such owners and breeders as Coolmore Stud and Sheikh Mohammed al-Maktoum, the breeders of this year's Derby horses include an improbably high number of small-timers who don't seem to know that Thoroughbred racing is supposed to belong to the Goliaths.