I dunno. Ivory, Jones, and Betts have all proven to be pretty reliably backs. Ivory had a breakout game, rushing for over 150 yards a couple of weeks ago. They just seem too hesitant to lean on their backs enough to open up the pass. When they become one dimensional they make horrible mistakes.
Pass blocking isn't as good as it has been in the past, and when pressured Brees has shown a disturbing tendency for making ill-advised throws. Turnovers have killed them more than anything, and Brees has been responsible for a large percentage of them due to interceptions.