The Jazz need an "advantage creator," someone whom you can rely on to consistently beat his defender, draw another defender, and make a play. Right now, the only guy who does that is Sexton, which is why we have to watch him kamikaze into paint defenders 30 times a night. Keyonte doesn't really do that. Keyonte has confidence in his runner, and he may regain his confidence pulling up for his jumper, but he's not really playmaking consistently.
One guy who is starting to show a few flashes of playmaking is Sensabaugh. I think it would be great if the Jazz brought in Joe Johnson to work with him and make 80% of the work be playmaking.
Otherwise, the cupboard is bare. I think the Jazz would leap at the opportunity to draft Williams or Buzelis as guys who can initiate actions, though Buzelis is another guy who isn't going to beat his defender off the bounce more than once per week.