We were at POR last month and obseved a bus pattern different from what everyone else seems to report.
Every morning, we took the East bus depot, the bus stop behind Magnolia Terrace. We noticed that in the mornings, the busses went to the back bus stops first, and then went to the main (south) depot before exiting POR. That depot was always full of people who had just eaten at the food court, and often people waiting there had to wait for another bus cause the crowds at that stop were so large, whereas there were only a few people waiting at the back bus stops. POR didn't share a bus with POFQ in the mornings.
Now, at night POR and POFQ did share busses (except at the MK). At night, POFQ was first, then POR's main (south) depot, then the back bus stops at POR.
I originally wanted to make sure I used the main depot in the mornings based on what I read here. I am glad DH talked me out of that. Every morning of our trip, that depot was very crowded and last on the circuit.