Gregory Shamus/Getty Images
Role: Carroll might have been listed third, or even fourth, on the Dolphins depth chart at cornerback if everyone had been healthy, but the circumstances of the season led to him playing significant snaps. He played 75.3 percent of the snaps on the season, but in three of the final six games of the season, he came off the field for just one snap.
Production: Carroll gets a bad rap, but according to Pro Football Focus (subscription required), he allowed completions on just 47.8 percent of throws in his direction, yielding just two touchdowns while intercepting three passes and breaking up another seven. Carroll rushed the passer just seven times, but managed to come up with two sacks.
Need: The need for Carroll will either be enhanced or diminished by what happens with Grimes, who is clearly the higher priority of the two free-agent cornerbacks. Carroll is the more economic option, but he is not a top-flight cornerback like Grimes, and would have been the No. 3 option if Dimitri Patterson had been healthy for 16 games. If he does not return, the Dolphins could turn to Jamar Taylor to be their new No. 3 cornerback.
Injuries: Carroll has dealt with some minor injuries throughout his career, but he has missed just six games in his four-year career and did not miss a single game in 2013.
Value grade: B
Erik Frenz is also a Patriots/AFC East writer for Boston.com. Unless otherwise noted, all quotes obtained firsthand or via team news releases.