I thought Disney transport didn't leave until 9am at the earliest, so an hour to 2 hours after that, depending upon traffic and in what order the hotel drop off occurs. I guess the bus could leave earlier if they aren't waiting for anyone, but there could be people who have 2nd seating that are going to GF too. We had to wait until 9:30 or later before our bus left, because they were waiting on a family that was taking a long time. The buses to MCO leave the minute they are full, but the hotel buses don't leave until everyone scheduled to be on that bus is there. You will have time to eat breakfast in the MDR for first seating. The bus won't leave without. I would do MDR breakfast. If you rush to get out there, you could still be waiting for another family who has 2nd dinner.