KoC has performed a miracle, IMO; he turned what could've been a major disaster into an upgrade of the Jazz roster. 
1. Jefferson > Boozer or Okur
2. Bell > Matthews. Who knows how Matthews will develop down the road, or how long Bell will continue to be an effective player. Bell does really take care of his body. I also think if the Jazz had signed Matthews, the Blazers would've made an offer to Fes we would not have been able to match. Big men are harder to replace, and most NBA savvy folks see the potential in Fes.
3. Hayward (likely) > any of the bigs at our #9 slot in the draft. He will be better than Korver. KoC could've reached for a 'project' big, but wisely did not risk ending up with a dud using that valuable #9 pick. 
Hayward, even as a rookie, looks to be a very sharp, focused young man who loves basketball and will do whatever is asked of him to win games. 
4. Last season KoC managed to get a #1 pick for Brewer, which I never would've expected. That pick was then used to get Al Jefferson.
5. Last season he also managed to dump the contract for the injured Matt Harpring without taking a salary cap hit. 
6. KoC saved the day a few years ago when we unexpectedly dropped several slots in the NBA draft order (lottery), but still was able to swing a trade to move up and take Deron Williams.