It wouldn't be a surprise to see the Patriots add a big, young running back to the mix, but they may want to wait until other teams trim their rosters. The Chiefs and Titans, for example, have several young running backs that are in danger of not making the 53-man roster.
The story was about the team possibly picking up recently-released Bills RB Karlos Williams. However Williams was passed by other Bills RBs on the depth chart and remains out of shape despite an impressive rookie season last year. However, the Pats are probably seeing the last year of RB LeGarrette Blount, so Williams could at least be a project guy for the future.