Eventually, everyone will be on the side of the by then fully exposed resistance. My plan to that looks towards Don's, as you put it, "Arrogance." He assumes that, as you posted, he is the King's only supplier, but, without telling the others, being the sneaky backstabber Raeodin is, he receives arms and supplies from several other retailers, and the empire also manufactures their own. Raeodin will see Don as a loose cannon, and order him executed. If I know how you made Don well enough, his outrage will force him to jointge resistance to seek revenge.