In reverse chronological order, Michael Wardian, Jerod Neas, Doug Curtis, and Dick Beardsley are four who come to mind with comparable or better marathon times than Hunter-Galvan (even controlling for sex) and equally prolific racing schedules. In introducing the doping specter in this instance, you have established that you're in the 92nd percentile of letsrun.com f***heads - impressive given the level of competition, but not a warm and happy position to occupy.