The Panthers added cornerback Antoine Cason and safeties Roman Harper and Thomas DeCoud, but the secondary remains the weakest position on the league’s No. 2-ranked defense. PROTECTING CAM: Gross retired in February after 11 seasons, leaving a huge hole at left tackle. The Panthers didn’t address the vacancy in free agency or the draft, confident they could find the answer on their own roster. They’re counting on Nate Chandler, a converted defensive tackle, or Byron Bell, last year’s starting right tackle, to win the job. That’s a considerable risk considering that job involves protecting Newton’s blind side. Both guard spots are also up for grabs. RETURN TO SENDER: Losing Ginn really hurts the return game.
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