Although some pilots do have personalities like drones, I can assure you that I would be able to tell the difference between a drone and the real thing.
I think it would be very hard for a robot to make it from the crew room, through security, onto the crew bus, onto the a/c and into the flight deck, all in full view of the rest of the crew. Now I will say I have flown with a few crew who not exactly what you would call the brightest people in the world, but have confidence in their robot spotting abilities.