The Redskins know that their lingering safety concerns and questions will not be answered until the pads go on for good during training camp and the preseason. All that the solid performance of Madieu Williams in the team’s OTAs and minicamp has done is open up the possibilities of who might start among the leading candidates Williams, Tanard Jackson and Brandon Meriweather. Cedric Griffin, a corner by trade, also could be tried at safety if needed. But chances are, the two starters will emerge from the first three, and Jackson’s history with new DB coach Raheem Morris could give him an edge in landing one of the spots. The safety play must improve this season (which the Redskins say they expect) over a year ago, when injuries and moving parts really hurt the cohesion in the secondary and affected the cornerbacks, who didn’t know if help was coming or not.