Sometimes in those equibase leading jockey/trainer charts they break wins down by sprint, route, 3yo, 2yo, class, etc.
I\'ve done no empiracal study, but when you have a jock that\'s in the top 10 after a few dozen mounts, and is 4 for 30 with sprints, but 0 for 19 with routes, I\'ve had success using it as a determiner to trim down my p3\'s and p4\'s. He may still be getting itm, but some guys just fall in a rut where they\'re not timing rides quite right at a particuluar track because of a bias change, or they\'ve hooked up w a trainer that has a preponderance of one type of horse or another ready for a particular type of race, etc. Lot\'s of ways to rationalize using such short term statistics, but if a leading jock is even money in a route race and he\'s 0/20 at the distance, I get a bit braver using other longer price horses on my tickets if the sheets have them reasonably competitive.