The Detroit Lions were not very aggressive in NFL free agency, choosing to save salary cap space to sign some key players to long-term extensions. Detroit desperately needed help at center, a year after Frank Ragnow's retirement left a huge void, and general manager Brad Holmes addressed it with perhaps his most significant transaction this year. The Lions signed Cade Mays to a $25 million, three-year deal in the hopes of solidifying an offensive line that struggled last season.