Well based upon Anaris' s stated purpose for this rule in my Q and A thread about realm mergers you are wrong about the purpose of the rule therefore your interpretation is invalid. The point of the rule is that no Ruler would ever accede that another Ruler is their sovereign.
I disagree with this interpretation. The OOC game play purpose of the rule is exactly as Geronus has described it: To prevent realms from deciding to merge peacefully to create a single larger, more powerful realm. The IC rationalization is as Anaris has stated.
