Walls is a former undrafted free agent, having spent a year with the Atlanta Falcons during his rookie season. Since then, he has been a part of the Jets' crowded secondary. He has 16 career starts and three interceptions. Walls got most of his playing time in 2014, when the Jets were dealing with injuries.
But the outlook on Walls' play is not favorable. Our friends at Bleeding Green Nation ranked Walls as the Jets' least-valuable free agent, saying:
In a backup buried on the depth chart, you want one of two things, the ability to play well or potential. Walls had neither. He was arguably the worst starting cornerback in the league in 2014 as part of the vaunted secondary John Idzik put together.
Additionally, Pro Football Focus gives Walls a rating of 67.9, good for the 23rd among 2016 free agent cornerbacks. For reference, Tavon Wilson had a 72.7 rating and Rashean Mathis was rated 70.6.
The Lions need depth at the cornerback position, with Mathis gone and a lot of uncertainty surrounding players like Alex Carter, Nevin Lawson and Quandre Diggs. Walls can add experience and special teams value to the roster (11 special teams tackles in his career). Still, based on his previous performances, Walls will have an uphill battle to make the final roster.