I dont think the number of shots is a big issue. The more skills your players have, the better it is. Just remember the glory days. This team had Bibby, Christie, Peja, Webber and Vlade in the starting 5. All of those players demanded their shots, and everyone could (and did) drop 30+ points in a game.
Now, when we play with Hayes, Garcia, Outlaw, etc. the other teams know they don't have to worry about them. This means our big scorers will have to face more attention. That's the reason why I would grab Barnes if he's available. I still believe he can be a great SF, despite his poor play at the end of last season. He's 6'9 and he could be a decent defender. Drafting him, we'd have a more balanced team. You start Thomas and Evans in the backcourt, with Barnes, Thompson and Cousins. You bring Jimmer, Thornton, Williams, Hayes and Whiteside (or a big from free agency) off the bench, and there you have your rotation. I don't care about Garcia, Outlaw and Salmons, they don't deserve minutes on the court (maybe just Salmons if Jimmer doesn't improve).