I should probably answer this, since I was the one starting this thread
We stayed in Coronado Springs first week of October last year and LOVED it! You will have such a great time.
About the buses: We had ADRs for pre-RD breakfasts in MK (CP one day, BOG one other day), Epcot (Akershus) and AK (TH) the week we were there. We are early risers in America, since we are Norwegians with a 6-hour time difference in our heads. So we tried to get on the first bus possible every day. In general, MK buses always arrived first. It seemed like the MK buses started to run around 6 a.m. for a 9 a.m park opening. AK buses were next, they started around 6.15-6.30. Then HS buses started around 6.30-6.45. We did not take advantage of EMH while we were there, these are the bus times for 9 AM park openings.
Epcot buses were the frustrating ones. We had a 8 AM ADR at Akershus, and wanted to make sure we arrived at the turnstiles, finished with the security procedure, in time for them to let the early ADRs in (which they do around 7.40). So we arrived at the bus stop early, as always. Bus after bus passed us. When the 3rd (!) bus in a row to MK arrived, we asked the driver if there were no Epcot buses. He looked very puzzled, and said that Epcot buses always started to run at 7. We said we had a breakfast ADR, and he replied that early breakfasts were at MK. It seemed to us that drivers had not heard about the pre-RD breakfasts at Epcot. When the 4th MK bus arrived a little later, he said the same thing - Epcot buses never leave until 7. So we explained the same to him about our ADR, he called his supervisor and was given permission to take us to Epcot instead of taking an empty bus to MK! Disney magic!
We arrived at Epcot around 7.20, and were very surprised to see how few people were there. At MK there were long lines at 7.20 the day before. So maybe it is true that nobody goes to Epcot that early?
Enjoy your trip!