If you owned the horse, you may think differently.......I believe that even though leaders win a high percentage, they have been brave enough to take the race up, and should not have their work undone by a horse getting a free run up the sprint lane.....the driver of the leader has no opportunity to hold that horse up for a run, by using his driving ability or luck, and perhaps sneak home.....the fence horse also needs to make it's own luck, not be given the free run!