Observation 1: The two most combatant members of the O5 Council are O5-6 and O5-7.
Observation 2: O5-6 dual wields revolvers.
Observation 3: O5-7 dual wields hair sticks.
Observation 4: Other semi-combatant O5 include O5-5 and O5-12.
Observation 5: O5-5 wielding multiple machine guns at once? He would find a way.
Observation 6: O5-12 probably generally wields two kinds of amnestics — spray and injection. Both only take one hand to wield; therefore, O5-12 dual wields amnestics.
Observation 7: O5-9’s token item is a knife. He also has another key item, 963-2, which could also be used as a one-handed weapon — though O5-9 is almost entirely non-combatant, if he had to equip himself for a fight, he would dual-wield.