Regardless of the system they adopt, the Jazz absolutely need a center who is willing and able to play in the lane as a pivot. Jefferson plays outside the lane on both sides of the court, as does Millsap, which leaves the basket completely open for opposing teams to attack the boards.
The Jazz actually miss Okur's big body inside on defense, as well as his ability to rebound, despite the fact that he's not a great defender. Maybe Favors will grow into that role and patrol the paint. To be honest, Favors would do well to pattern his game after Tim Duncan, who is very similar physically, although less explosive. If Favors is going to be a PF instead of a C, then I think the Jazz will take a hard look at Enes Kanter in this draft as someone who is willing to play physical in the paint and bring in double-digit boards every night. Duncan extended his career by insisting that he was a PF rather than C. Jefferson/Favors/Kanter would be a very solid front-court rotation.
If the Jazz are keeping Devin Harris, they should bring in another guard who can share the responsibility to move the ball. Letting Harris spend some time off the ball will help him open up his offensive potential as a slasher and dish-off player. That's why I think Brandon Knight might be a good fit at SG.
Still, the Jazz need a go-to scorer besides Jefferson, someone who is an emotional leader and fierce competitor at both ends. That's why I think Derrick Williams could be great here as a Ron Artest/Carmello Anthony/Paul Pierce power-3.