I agree. Alice, you are likely going to need about two hours (maybe an additional 30 min) from wheels rolling to rope drop.
There are quite a few variables, including:
- bus departure time from MCO
- load out (how many stops)
- front desk workload (mainly with departing guests)
- Dolphin car availability
- traffic to AK
- if your room is ready you'll want to take luggage up
- if room is not ready, you'll want to check luggage with bell service (who may be busy, too)
... just to name a few. Not to bring you down, but it is going to be an early morning

You can mitigate some of it by using only carry-on luggage for the morning (checked luggage with go to resort via RAC), doing online check-in (desk should have room key or reservations ready, so you wouldn't even need to actually check-in with the desk), and maybe splitting up to have one person run to the Dolphin to get the car process started while the others get the hotel set.
Good luck, and let us know the strategy and how it worked, please!
