Drinax based fiction- a question


Banded Mongoose
I’ve finally got around to reading the ebooks based around PoD and I was wondering if the Dukes of Paal and other nearby systems that are on the Floating Palace have been given (inherited?) those positions from Oleb and are not the actual nobles? What would happen if the PCs make Paal friendly and the Duke wants to move in and take over?
If they aren't the original nobles, they'd be installed as the new ones. If they are original, and Paal becomes friendly, they get confirmed as Drinax-allied.