Particularly, Major Nobles like Hudson, who are both exceptionally skilled in combat and very young, are prime targets for suppression.
Fortunately, the Koslow Family's heritage isn't deep; they are currently being pulled forward by Hudson and can only muster the resources of an Intermediate Aristocracy on their own.
The Koslow Family, with its shaky foundations, is essentially a castle in the air, subsisting and slowly progressing is fine, but being too ambitious and reckless would quickly lead to its collapse, providing the Royal Family with a small measure of relief.
In fact, initially, the Moxi Duchy only wanted to tear two or three provinces away from the Warhammer Kingdom, but nobody expected that under Hudson's manipulation, they would end up securing half of the Warhammer Kingdom.
Hudson himself carries enough weight, and coupled with the constraints of the Magic Contract, the cost of breaching it is exorbitantly high; naturally, he could only honor the promises made.
