Provided they stay healthy, ESPN Boston expects second-year RBs Stevan Ridley and Shane Vereen to get the "bulk of the work" in New England's backfield despite the signing of Joseph Addai.As do we. Beat writer Mike Reiss considers Addai an "insurance" back, which is made pretty clear by his non-guaranteed $725,000 base salary. With Danny Woodhead also in the mix, the Patriots' backfield promises to again be a fantasy pain in 2012, but who carries the ball when during the preseason will be worth monitoring closely.