Not to mention, Arrington shouldn't be seeing any more snaps than necessary. He is, quite frankly, a mediocre defensive back to use in nickel and dime packages only but has been pressed into a starting role.
He doesn't have recovery speed, the physicality to bother receivers at the line and as you guys have pointed out, his one on one coverage skills downfield are atrocious. In zone nickel and dime packages where he can keep a man in front of him, keep an eye on the QB and break on the thrown ball, he is pretty solid.
As previously mentioned, Talib can't get back fast enough. Luckily for the Pats, their schedule is soft.
Also, Dons, bit of advice. Don't have anything around you that you can throw during the Denver game as watching Arrington cover Decker, Welker, or Thomas might cost new a new television.