One of the places that extra buses park until called into use is POFQ. So if you are at the bus stop and MK bus pulls up and has to leave people behind, the driver calls and says so, it takes like less than two minutes for them to send another bus since it is right there in the parking lot. We stayed in 2008, when they always shared buses at POR and it was a little crowded, but not horrible. But when we stayed in 2014 at POFQ we only shared buses on the last day of a 13 day stay. We were leaving mk during middle of afternoon to go back to POFQ, we got to the bus stop and it seemed different, then we noticed that they changed and it was no longer for POFQ, and the one for POR now stated both POR and POFQ. We went to that stop and when the bus pulled up we were still the only ones waiting for the bus. So they only share at times when it is very quiet and not crowded. Other wise we never shared. The park crowd level for the day we shared was a 2, every other day we were there and did not share the park crowd level was a 4 to 6, if that helps.