It always amazes me how these guys are unable to play banged up after they sign their new contract... if either of these guys were in the final season of their contract (like Smoot) they'd find a way to stay on the field... they don't care how good their backups are doing, they already got paid...
With little to no hope for postseason play it would only make sense to place Barrow and Arrington on IR and make use of the roster spots. Who knows we may find another Ryan Clark, Antonio Pierce, or Joe Salave'a out there.