Fortunately the flight is direct and should be on a plane that begins the day at my airport, so the risk is a little mitigated... but it is something I may have to deal with.
DopeyBadger, I knew I could count on you for a calculated verification of when I might hit the start line and I appreciate it. Regarding the 5am spectator bus from POP... does that ONLY go from POP directly to Epcot and if so does that mean that those spectators could then catch the monorail over to TTC if they wanted to see me before, during, and/or after MK? In other words, if they could get to TTC they could either see me entering MK/exiting MK around the TTC and Poly or they could go into MK to see me once in there. How does Disney facilitate people going in MK before the park opens and then get them out of there? My family will all have magicbands, but I'm guessing there is a way for people to go in there for some period of time without park admission to view the race while it is closed.
I'm guessing that the 7am buses you speak of are the "normal" hotel buses that go to parks in the normal course of a day. If I was in a later corral or a different pace, I'm guessing people in my party could catch one of these and get straight to MK if they wanted to go that route or get to AK, HS, etc. in a similar fashion.
So I guess you are saying your family was able to walk from AofA to mile 16.5 or did you have other transportation?