MINNEAPOLIS -- The Minnesota Vikings' plan for improving their roster this offseason centers on the continued retooling of the defense. They need pass-rushers, a safety to start opposite Harrison Smith and more cornerbacks. Some of those needs will be sorted out in free agency while the ones the Vikings don't get to in the coming weeks become a high priority during the draft. But before the Vikings can carry out their defensive to-do list, they need to answer questions on the other side of the ball, beginning with the offensive line. Minnesota's financial flexibility in free agency hinges on a decision with left tackle Riley Reiff. Will the Vikings attempt to extend him to lower his cap number or will he become a cap casualty?