Offseason additions haven't provided enough benefit for Redskins

ASHBURN, Va. -- The Washington Redskins haven’t tried to rebuild their roster through free agency. They have tried to fortify it that way, of course -- but the misses have added up after Wednesday’s moves.

Offseason free-agent signings are just one way to build a roster; the Redskins’ offense is now largely homegrown (for a change) while the defense remains patched together. They’ve added contributors such as kicker Dustin Hopkins and defensive starters Will Blackmon and Mason Foster (in 2015) and Cullen Jenkins (this year).

The position players all were supposed to provide depth, but have been pushed into starting roles. The Redskins hope safety Donte Whitner, signed Wednesday, will…