Questions about SOTF

In the scene where R-vis and Ostius interrupt the meeting of the military senators, the Princeps insinuated that they had a role in orchestrating the Cataclysm and knew why they were necessary. Maybe I am misremembering the quote but this felt very important at the time and was never revisited. If this is true, what could that insinuate about the relationship of the Military senate to Ka and The Concurrence? I think it makes sense that one or the other is the one ultimately pulling the strings in the Hierarchy, but I was frustrated that Vis did not press Ostius more about this. I’m interested to hear others thoughts and theories.