That's not how it goes down in practice, where a Chief Diversity Officer's job is to control diversity, rather than to let it flourish. The only "rules and arrangements" that trickle down from the top are the biases, actions, and behaviors of senior leadership. They are the ones who really set the examples. A company with a Chief Culture Officer sounds like one where the leaders are not interested in culture. That's why they hired someone else to "handle" it.