A few weeks after letting him become a free agent, the Vikings have brought back DE Otis Grigsby. Earlier this off-season, the Vikings also gave DE Jayme Mitchell a two-year contract, plus they may have Kenechi Udeze back this year after his bout with leukemia. So they’re pretty set for defensive end depth. The uncertainty is in the middle, where Pat and Kevin Williams still face possible suspension for taking pee-pills they claim they didn’t know were against the rules. Fred Evans and Jimmy Kennedy have both been retained as insurance against a temporary dismantling of the Williams Wall.