Is there some sort of cycle? What would Polybius say about the ideologies presented in STAR WARS?

Polybius believed that government goes in a cycle: monarchy, tyranny, aristocracy, oligarchy, democracy and anarchy. In the "Empire Strikes Back", a tyrant rules the empire. The rebels are fighting for a republic and fighting the tyrannical monarch. If they succeed, a republic will replace the monarchy. While it is not following Polybius’ cycle exactly, the episode is still moving from single ruler to representative government.