Story has also slipped a little with the glove and range, but it's the arm that is the major issue.
Not only does he make to many bad throws, the slow throws don't show up on FLDG% or Error counts.
I actually like Story, and while the Ks are bothersome, he seems to get more than his fair share of RBIs, so I've lived with it. Ideally he bats 7th vs R and 6th v L, and plays 2B. Who plays 2B and 3B is a secondary issue.