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Carlos Rogers has three interceptions thus far
In 2010, the defensive backfield was a weak link for the 49ers defense. Early in the 2011 season, it looked like much of the same. This unit allowed the Cowboys to throw the ball successfully and drive for two late scores, which beat the 49ers in the second game of the year.
However, as the season has progressed, the secondary has improved dramatically. Free-agent acquisition Carlos Rogers has provided stability to this group and is a major upgrade over Nate Clements, who he replaced. Rogers leads the 49ers with three interceptions.
When safety Dashon Goldson returned from injury, that was also a boost for the defense. Goldson missed the first two games and this unit struggled. Goldson has been very solid at one safety position.
The other safety spot is held down by former Buffalo Bill, Donte Whitner. He is a good run-stopper and has been adequate in pass coverage.
Shawntae Spencer was supposed to be the other starting cornerback, but injuries have caused him to miss too much time. He has been replaced by Tarell Brown who was, frankly, very weak early in the season. However, to his credit, Brown has been improving and I felt had his best game of the year at Detroit.
Rookie Chris Culliver is also contributing as a nickel or dime back, which is a pleasant surprise.