It was good to see him take the lead like he did," Rivera said of Mitchell. "This may be one of those things where a guy gets an opportunity, the door is cracked a little bit, and he steps all the way in. I've got a lot of faith that he's going to get it done."Rivera has no other options to move Mitchell after Charles Godfrey was lost for the season with an injured right Achilles sustained against the Bills.Dannell Ellerbe (Miami), Bernard Pollard (Tennessee), Paul Kruger (Cleveland) and Cary Williams (Philadelphia) are gone as well. The Ravens will have a new look and that may not be a bad thing, especially if modest investments in veterans Elvis Dumervil (five years, $26 million), Chris Canty (three years, $8 million) and Michael Huff (three years, $6 million) fill the void on defense. Joe Flacco earned his $120.6 million extension during the Super Bowl run and will be asked to take on an even greater leadership role with Lewis' departure..

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