Those stats don't really say anything about the strengths or weaknesses of Whitner or any of the players on the list. Some are better than him, some are worse. However Berry, Polamalu, Wilson and Laron Landry all make more than what Whitner is reportedly asking for (7 Mil) and all are old contracts except for Berry, who makes the most of all of them, so it's difficult to compare the $7 mill number against their contracts. The question isn't really how good is Whitner, which is probably average to above average, but what they'd replace him with or what resources (2nd round pick?) they'd have to use to get that replacement. You also conveniently left out tackles.
It's almost too easy.