The rigger did tell you that the attackers were after a list of locations protected by Luna, meaning if he has Luna's rigger stuck in limbo for a couple of hours, he could attack several businesses while only dealing with autopilot drones.
With Kynos intimidation roll I'd assume that you too can get the list of locations. They have proto drones for the outside and several well-armed bumble bees for secure facilities.
Inside the facilities they relay on Steel Lynx with automatic weapons and grenade launchers, as well as sword-wielding walker drones (forgot the name - but I think I replaced their swords with stun batons as it seemed less pink mowak than a sword wielding robot. ). They also maintain a relatively large array of flying eyes for recon purposes to position the combat drones better - but these things are out of Luna's job. They provide extra riggers when a facility is under attack - they are not in charge of the physical security.
Why have just one rigger on site rigger when you are a com call away from having several of them, jumping around the drones.