The Pilot rating measures how "smart" the autonomous systems (the "dogbrain") in the drone are, thus how complex a set of instructions they can carry out on their own. If you the rigger/operator have given them the command of "shoot anyone wearing this (insert picture) jacket" then most drones capable of carrying weapons will do so. However, if you tell your drones shoot only this guy (insert picture) when he is wearing a kimono (insert picture) made by this designer" the lower pilot ratings might not be able to get it right.