After originally floating plans that would have required any jockey intending to ride during the Sept. 1-5 meet that includes the GI Kentucky Derby to arrive in Kentucky by Aug. 24, Churchill Downs is now requiring that all jockeys be in the state by Aug. 31. The details were in a document distributed by Churchill officials to the Jockeys' Guild late Thursday. Many jockeys, particularly those who ride regularly in New York and California, were on the fence about riding in the Derby as, under the Aug. 24 guidelines, it...