How Did Tanistry Complement Conquest?

In the chingasin model, extreme centralization of political authority was intimately linked with the notion of universal sovereignty. And then chingasit empires, also managed succession. Succession through tanistry, a way of handling cession that is different from the primogeniture model more common in european monarchies. In tanistry members of the ruling house are all eligible to inherit, but there is no established order of secession.