Your assessment is spot on, but in New Orleans, Capers didn't have the horses to get it done. As I mentioned somewhere else, Packers needed that central core, right up the middle of D. Jones, Burnett, and Shields. Clearly the Packers value the speed of Burnett and Shields, as they shelled out some decent cash for those two. Like most teams, they can't afford to have three starters out, especially at high value positions, and on a defense that doesn't have much wiggle room for error.