You may be right, but I heard what I heard from Disney resort employees (two different ones at two different times). Do all those early buses of yours provide (discretionary) service to MK resorts for guests with early breakfast reservations? I was told that only one bus provides such service and that bus comes only once at 6:30.
Respectfully, and I'm aware goofy4tink has already responded, the ONLY Cast Members I trust regarding transportation issues and questions are, well, Transportation CMs. There are several who post here on the Transportation (sorry for being repetitive) board. In addition, I trust my own experience and knowledge.
Yes, dropping Guests at a resort is discretionary based on the driver's schedule (and, unfortunately, sometimes mood), but there is NO way in the world this action could possibly be restricted to ONE bus going to ONE park. ALL the parks have breakfasts scheduled to start an hour before the park opens on non-EMH days; many of the resorts property-wide do, as well.
As for resort Cast Members being wrong about transportation, well, my one experience with that is, during Magic Kingdom Evening Extra Magic Hours - ending at midnight on the given night - I was trying to get from Wilderness Lodge to Pop Century or Old Key West (yes, I forget, I'm old

) and at 10 PM the Lobby Concierge CM told me I had to take a bus to Downtown Disney and switch there. Now, the boat may or may not have still been running - but the bus to the Magic Kingdom absolutely was, and saved me an hour or so in travel time
