Time to start over at cornerback?

The most disappointing position group for the Panthers this season was easily the cornerbacks. According to Pro Football Focus, James Bradberry, Donte Jackson and Ross Cockrell all were graded under 60.0 for the year and their run defense grade (38.1) was the lowest of any team. Bradberry is expected to sign a massive extension this offseason. However, the team has to at least consider letting him walk, throwing it all out and starting over from scratch. Picking a cornerback at No. 7 would be a good place to start.