U r thinking more along the lines of drone swarms and not a 6th gen fighter. Drone swarms might be more useful in things like taking out a SAM system.
I sort of talked about that thing here
China launches record-breaking UAV swarm
A 6th gen fighter leading a formation of drones(pilotless aircrafts) would be a more specific mission with some purpose, where a human might be necessary rather than trusting it to AI. Both of these things are similar yet different...a drone swarm can be just for utter area destruction while a human leading specialized drones would be rather for a more specific objective...kind of like the difference between a machine gunner and a sniper.