Haven't seen any real update on the depth of Holt's contusion, but as others said, probably a week or so assuming no structural damage or laceration. Nunez has played extensively all year mostly at full speed for him and that rundown was another shot at his legs, but he did get the out. Swihart is limited to the bench as Leon's Backup. Lin is a backup's backup. Among Pearce, Bradley, Martinez and Moreland , one has to be sitting in a given game, and it won't likely be JDM. This is a "short" bench with 2 of the guys being AAAA'ers.
My point is that DD and Cora need to take a hard look at the 13 pitchers, including the PawSox fill-ins and get down to 12 and put another functional player on the bench. Brandon Phillips will likely get this chance soon. Nunez and Holt should have been the ones to provide veteran utility presence playing 2 or 3 times a week but have become full time infielders due to Pedroia's lingering problems. Still the team is set for it's 70th win, with no other team beyond 65.