I understand your logic, but think it is a bit misdirected. Rudy is NOT a starter in the league...it's still going to take a couple of years (if ever- he may just be a rim-protecting sub). And I don't think you keep throwing good money after a guy who has shown he can't play defense.
Favors IS a legit starter. He's improved his offensive game every season. What the Jazz NEED is a 4 who can hit shots. Rudy doesn't have to start. He can get most of his minutes behind Derrick. And they could legitimately play 5-10 mins together against backups down the road. The problem the Jazz have right now is they don't have guards or SF's that are hitting their 3's. Hood, Hayward and Burks need to become threats. And if Trey continues to throw up bricks, he needs to be dealt, along with other assets, for a legitimate starter.