The recruits becoming capable assassins — the investment in their training paying out as a network of operatives who can be dispatched, who can contribute to the liberation that no single person could accomplish alone. The Brotherhood is the quiver. Ezio is not trying to do this himself. He is trying to build the capacity for Rome to free itself through the people he has trained, the organization that can persist past any individual's ability to act.

Revolution is what happens when enough arrows are accumulated and the quiver is pointed at the right target. Brotherhood's mechanics make this visible in real time — the increasing capability of the recruit network, the expanding coverage, the moment where the organization becomes self-sustaining.