Correct it is necessary to train for any endurance event that is common sense. 26.2 is 26.2, a certified course is a certified course, and a legitimate event is a legitimate event. Because participants are limited / restricted to only those that can maintain a minimum pace requirement does not make an event more or less legitimate. You point out The New York City Marathon, absolutely legitimate with the best / fastest, most proficient, world class athletes participating, a top-notch world-class marathon. YET! the New York Road Runners Club has worked it so the average participant, the non-athletes that (maybe the one major event in their lives) get to finish the distance, complete a marathon by keeping the course open for 10 hours. If New York Road Runners Club and the City of New York can conduct a world class (legitimate) marathon considering the best in the world and the back of the pack average person so can Disney. Actually, it should be easier for Disney since run Disney is not trying to attract the world class runner with prize money and the events occur entirely on Disney property reducing the amount of government coordination to be done. The minimum pace requirement set by run Disney is dumb resetting it to 18 only makes sense. There is no maximum limit, if a participant wants to set a course record, P.R. or simply enjoy a fast run, go for it. A quote from Fred Lebow (founder of the New York City Marathon) "whether you finish first, in the middle of the pack or last you can say I finished, there is a lot of satisfaction in that".