This could easily be resolved IG if the seceding realm would simply observe a cooling off period of, say, a week, to allow the opposing realm to revise its troop deployments. I think you guys are over analyzing this. Forget about the intent. Trying to get inside the player's mind is a mug's game.
Um really? If it IS a strategic Secession the issue is the ability to continuously field a force with significantly reduced refit times. A weeks grace isn't going to change the advantage that provides. Changing your troop deployments to respond is more then likely necessary, but won't change the fact that your enemy will recover losses much faster then they once did.
Likewise you could say, oh just have the realm be "neutral" Oh what a surprise when a region is taken over is being transfer to that neutral realm as soon as is possible.
