The problem with only having 1 pilot aka a captain on board is, how do you make people captains. Where do they get their training and hours of practice for the 1 person cockpit. Will the training happen on the ground in real flight simulator like environments And they who are not found suitable to proceed to take on multiple simultaneous remote controlled flights, will be offsided to yellowperil's "Flight Manager" position in the sky.
At least that way the ground based pilots could have regular job hours close to their place of home and without having their days extended by regular unforeseen circumstances. The flight(s) in progress would just be handed over to the next shift, like in air-traffic control.