She points out that the Incas often governed in pairs. Hanan Cusco (Upper Cusco) and Hurin Cusco (Lower Cusco) were in perpetual tension. Some Sapa Incas ruled jointly with a co-emperor (like Pachacuti and his son Tupac Yupanqui). This was a deliberate system to avoid absolute monocracy, though it eventually led to the Huáscar-Atahualpa civil war.
The book provides a rigorous analysis of the rise, peak, and fall of the Inca state. If you are studying the PDF or physical copy, these are the core concepts you will encounter: 1. The Myth of Linear Succession maria rostworowski historia del tahuantinsuyo pdf
Find a (e.g., on the Chinchaysuyo or the role of women). She points out that the Incas often governed in pairs