Actually, I believe he/she/they fall into the, "Spree Killer," archetype more so than the other two...
...and it is not uncommon for spree killers to work w/ accomplices ala Lesko / Travaglia, Starkweather and his chick, etc.
"We're working as hard as we can," he said (Moose). "People are continuing to give us information; we're following up those leads. We want people to keep the faith and remember this is certainly not the first person or group of people who tried to change us or change the nation. So please continue to be resilient."