Did you specifically pay attention to the front of the bus to see where the busses are going? Maybe they are cast members in training .
If the monorail is not running to Epcot , maybe they are picking up guests to take them to Epcot...
I know the road in front of the Contemporary is so narrow , it is doubtful WDW is picking up guests from TTC to create more traffic flow into the MK. The ferry boats (sometimes 3 ferry boats at same time if huge crowds ) and the monorail are provided. I am not saying this never happens, I just wouldn’t expect it on daily basis.