Cook has manned three positions on the line -- right tackle, right guard and center. He adds needed depth to a very thin Cowboys line.
Entering the game, Dallas had six solid NFL-quality linemen to activate on game days, the five starters and backup OT Jermey Parnell. David Arkin improved, but he's not strong enough to ride for any length of time should Phil Costa go down. Left guard Derrick Dockery has NFL experience with the Bills, Redskins and Cowboys, but he looked shaky this summer, being a late signing after injuries sidelined Kevin Kowalski and Bill Nagy.
The Cowboys were two interior linemen short of the usual eight which teams dress. Cook's size (he's 6'6", 328 lbs.) and versatility may let Dallas dress seven, and use the eighth game-day spot on a special teams player.