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In the twilight of his career, Winfield will likely see his role limited to the nickel. He'll start opposite Cook on the outside at the beginning of the season, but I expect him to eventually be replaced by Josh Robinson as the starter.
Along with my expectation of Robinson eventually becoming the starter opposite Cook, Robinson will probably be used extensively on special teams.
Bowman wasn't very good in coverage for the Bears, but he was a solid tackler on special teams. I imagine that will be the extent of his role with the Vikings.
This last CB spot will come down to Asher Allen and Burton. Allen has had a lot more time to show that he belongs, and my current opinion says that he does not.
Raymond may not have done much in 2011, but he's got potential as a free safety playing opposite Harrison Smith.
Blanton will have an opportunity to fight Raymond for the starting job. From what I've heard, Blanton impressed coaches at rookie mini camp.
Despite not playing extremely well in 2011, Sanford is a fantastic special teams player and worth the roster spot.
Pretty much the same reasons as Sanford...