"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
I believe that the will of the people is resolved by a strong leadership. Even in a democratic society, events depend on a strong leadership with a strong power of persuasion, and not on the opinion of the masses.