I think the key here is stamina. Horses who get by on their speed, like Summerly and Spun Sugar and, to a certain extent, Happy Ticket, have to work harder to keep going in front, even with those slow fractions. As a result, one will see more races that 'fall apart' late, with the speed stopping midstretch and horses from behind keeping on. Many turf horses are required to run at longer distances than dirt horses are these days (something I deplore, but I digress) so turf horses will tend to have developed more stamina.
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