Veteran DT Grady Jackson, a mammoth, 350-pound run-stopper, was arguably the biggest free-agent addition to the Lions' defense this winter.
But coming off knee surgery in mid-February, the 36-year-old Jackson has yet to take part in on-field workouts with the team this offseason. And he was missing again Tuesday as the Lions began their final three-day minicamp in Allen Park.
Fantasy Impact: