The Cowboys were already displeased with their interior OL situation when they found out that C Phil Costa, the uninspiring favorite to start, had suffered a back injury, the extent of which is not currently known. That means that David Arkin (a guard by trade) could be switched to center in the meanwhile, but Harland Gunn (who suddenly is in the picture) and Mackenzy Bernadeau (initially pegged as a starting guard) also could factor in there once he’s healthy enough to play. Journeyman Derrick Dockery and undrafted Ronald Leary have entered the mix at guard now with C Kevin Kowalski (ankle), OG Nate Livings (hamstring) and OG Bill Nagy (ankle) all hobbling. Even the known elements, OTs Tyron Smith and Doug Free, are not showing their best. It’s madness along the line, and the Cowboys do not like what currently sits on the free-agent market. Improvement and better health must come from within now.