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Free is relatively irreplaceable, not because of outstanding play but because of the lack of known commodities behind him.
Free bounced back from his poor 2012 campaign by having a solid 2013 season. Pro Football Focus (subscription required) graded Free at plus-18.9 for the 2013 season, which is above average. With Free entering his ninth season with the Cowboys it is unlikely they he makes any vast improvements.
There are no players behind Free with any significant playing time in the NFL. Darrion Weems and Jermey Parnell have yet to see any significant action outside the preseason. Therefore, if Free got hurt, it would be hard to have any real expectations for Weems or Parnell.
The reason Free didn't make rank is because he doesn't have the type of production that the others do. A loss of Free would hurt, but it wouldn't cripple the Cowboys.
In 2013, PFF graded Orlando Scandrick as Dallas's best cornerback among those who played snaps to qualify. This has led to Scandrick starting the season as the starting cornerback, opposite of Brandon Carr, while also taking a leadership role on the Cowboys defense.
Scandrick has the versatility to play and excel at any of the cornerback spots. He has been known for his play at the slot corner but he has also showed the ability to be a excellent boundary corner as well.
Behind Scandrick is former sixth overall pick, Morris Claiborne, followed by B.W. Webb, Sterling Moore, and rookies Terrance Mitchell and Tyler Patmon.
To lose Scandrick would be damaging to the Dallas defense. However, they do have Claiborne who could step up to take the boundary cornerback duties, while Moore, Webb or either of the rookies would battle for the slot position.
While the loss of Scandrick would be bad, it's just not as bad as some of the others on the list.
Coming off of a torn Achilles tendon, Church did as well as you can expect in 2013. While he wasn't great by any means, Church should improve with another year under his belt. With the injury to Lee, Church needs to step into a leadership role and help improve the defense.
Church is a great tackler who is improving in coverage as he gets more and more snaps under his belt. Behind Church, there are not many good options. Seventh-round pick Ahmad Dixon would figure to be one of the options, J.J. Wilcox could also move over from his strong safety spot.
However, none of these are options with which fans should feel comfortable. While it's true that Church doesn't have an adequate backup, he also doesn't have the production that some others on the list do.