every now and then CO uses the 'B' for arriving flights. I havent heard of any flights departing from the 'B', they simply tractor the plane over to the 'C' term once they get it unloaded.

maybe C&I have them do it when they get backed up at 'C' or they are simply out of open Gates at the 'C'.

whatever the reason, if the people picking one up doesnt know that, then you have to drag everything over to the 'C' term to met your ride. Either way by renting a cart or using the AirTrain, I wouldnt want to have to do it.