The Diagram isn't finished

Taravangian sent Szeth to kill leaders in accordance to the Diagram, he killed two Azish emperors so that Yanagawn would be left in power, why? Because he was the only one who could have broken into the palace to reclaim the throne in the final day.

I think we will continue to see the Diagram's influence in the following books, but now these influences will work in opposition to Taravangian.