I'm kind of wanting a great hc, who will run overall team, and have great oc and DC to do their respective duties. Get a hc focused just being hc, not hc of that side of the ball.
Then I would say your top target would be Vrabel. You could also keep Rizzi. The problem with that is you will have to constantly replace your great OC with another great one.
Look at the Bucs. They had Canales one year and he’s head coach of the panthers. Coen is in his first year and he’s a top HC candidate. On the other hand you could struggle to find a good one. Tomlin has had that struggle in Pittsburgh. He’s been going through 1-2 OCs/year. Finally he got a good fit in a fired HC, Arthur Smith.