NBA Playbook's Sebastian Pruiti thinks the combination of Jonas Valanciunas and Andrea Bargnani can work on the defensive end. It's an interesting theory. And Mr. Pruiti is one of the best at breaking down the nuances of the game. But why not just pair Valanciunas with productive players like Ed Davis and Amir Johnson and avoid placing the responsibility of covering Bargnani's massive defensive flaws on the shoulders of a 20-year-old rookie?