This is in theory correctable, and hasn't happened every week. Against the Giants, Cousins had similar issues, but they haven't cropped up in every game. It's much easier to say than do, but Cousins has to step into his throws regardless of the threat of being hit. He has done that for large portions of the season, but there have been multiple occasions where he has plays like the one above and the ball sails on him.
Tougher opponents: Obviously how the Redskins fared in these matchups plays a factor with any league-wide rankings considering so few games have been played.