Argyle King
Legend
Most frequently that's seen as being because the soldier's/adventurer's viewpoint has changed as a result of what they've seen, rather than their home changing. An exception to that would be "The Scouring of the Shire" in "The Lord of the Rings", in which both the characters and the Shire have changed.
Airk will be returning to his original destiny, which will be to become the king. Kit's destiny was to become a political chess piece. Obviously that will have changed because the other pawn, Graydon, isn't quite on the same board anymore. Or maybe he will be?
I'm not sure that Airk ever would have been king. If Kit and Graydon were meant to join two kingdoms, that would have meant they would become king and queen. Airk would remain in a lesser role than Kit.
Regarding a soldiers viewpoint: I can somewhat agree with that. A change in viewpoint can mean seeing that what you were told was good/evil may not be how things actually are. Sometimes it also means realizing that the criteria you were given for how to evaluate others as being "bad" applies to those who instructed you to fight it.