Unless Caesar III committed deplorable deeds that offended both gods and man, Hudson would consistently remain the kingdom's "loyal subject".
Hudson's refusal to defect was primarily due to the underwhelming offer of the Moxi People. The Mountain Domain he owned was not merely the outer mountain range but also included the vast swamp and port behind it.
Now that he had money in his hand, the value of fully developing these places would not be inferior to that of half a province.
Especially since the domain offered by the Moxi people was uncontrollable. George didn't mention the specific location, indicating it would most likely be at the front lines.
Only the Border Province would not face opposition from the Major Nobles within Moxi Duchy.
As for acquiring domains in two countries at the same time, that was only theoretically possible. In the event of armed conflict between the two nations, he would have to fulfill military obligations to both.