I'll go ahead and say it out loud. I think bringing back Favors in free agency and drafting Udoka in the 1st round are part of a contingency plan in case the Jazz can't can't come to an agreement with Rudy. I think there's a certain deal that the Jazz are willing to offer Rudy, and beyond that they'll trade him or let him walk. This narrative that the Jazz "need to improve their defense when Rudy is off the floor" is valid, but it's also a cover story.
The Raptors just did something similar with Fred VanVleet. They drafted Malachi Flynn (a FVV wannabe) and just gave VanVleet an exorbitant contract. If that negotiation didn't work out for the Raptors, they would have let Van Vleet walk (or executed a sign-and-trade) and given the backup PG role to Flynn.