That gets it wrong. Capital came far later as a goal over the literal strongmen involved with the monopoly of force. The reason they were treasured was because the capital specialists made more money by being taxed than flat out taking everything up front. Monopoly on force is brutally darwinian in that the emergent result of what it cares about it self-perpetuation. The real first layer is the enforcers to be kept loyal. In a more complex system there are specialties and layers of dependency like needing to appease the manufacturers and maintainers of weapons to keep the enforcers using tanks and planes instead of sharpened sticks.