The answer has been given but I'll elaborate a bit. RAC (Remote, or resort, airine checkin) counters open at 5am. In order to have your bags taken directly to the airport and get your boarding passes printed at the resort, you have to be completely finished with your transaction no less than 3 hrs before flight departure. So, if you have a flight at, say, 8am, you won't be able to use RAC..no way can you be done with your transaction in that time frame since the counter doesn't even open. Flights after 8:30 are doable, tight, but doable.
So....those who are not able to check their bags at the resort, will just take the bags with them, to the DME bus. The bags will go underneath your bus and handed off to you when you get to MCO. Then, you just check your bags and get your boarding passes the 'old-fashioned' way.