Free agency never truly ends.
Though it certainly goes through ups and downs—and is never more notable than when the new offseason period begins in March—it continues on, even now. Sure, recent signings Jake Scott and Micheal Spurlock may not be as recognizable as Reggie Bush, but they reflect that the Detroit Lions are still not done trying to improve the team.
An important thing to note is that the players listed here are not necessarily players the Lions should definitely sign. Things like health and salary demands can quickly turn a good idea into a bad one.
So rather than a wish list of players the Lions need to sign, this is more like a set of suggestions that seem consistent with who the Lions might like to kick the tires on. Whether a contract comes of an ensuing meeting/workout is entirely up to them, but these are the guys who might be worth it.