There are some things he did not say. While he does have his own scheme this did not mean that other people did not have their own schemes
And he also realizes someone is making use of his scheme to scheme about some other thing. It is fortunate that the objective of that person scheme and his shame did not overlap.
He could guess there is another dark hand that is guiding these war to the current situation. Why would the three great noble families of Karak suddenly rebels?
At the very least, there is only two families that would join in the enemy and rebel against being the vassal kingdoms of the Empire
It did not make sense all three of them rebel unless they were incited by someone.
But even then what kind of confidence that they have that they will succeed in their rebellion? If they did not have even ounce of confidence and knowing it is a fruitless effort, they surely would not have done such a thing.