beta
I would let him keep the city but I would take all the people with me, be a king of nothing and fool yourself all you want, after some time without people the city is going to be doomed
Also this is as easy as to trick him back, yes you manage everything and we are allies and kill him the next day, or just expose him to the people as another traitor, their special forces were too efficient and effective, now you're telling me that they are able to identify suspicious people?
Just kill him and I'm so cruel saying this but they should consider having casualties