The "rules of precedence"? Do you mean in a purely social and private setting where the host gives precdence according to title? Of course that's possible, but Cole is also referring to legal and formal standing inside the UK. A legal logic in a monarchy and ceertainly in a republic. "Foreign" is foreign and invisible on legal documents (even though I was harangued otherwise round here by certain others insisting that Markle had a "formal" right in the U.S. to have "Princess" on all government-issued docs. because the "emoluments" clause doen't actually prohibit it. Although the emoluments clause is irrelevant. A foreign legal style is legally invisible outside the domain where it was issued.)