Not only the Oline, but, remember all the off season reports about players (and I mean almost all of them) have gained muscle weight? Some as much a 10 or 15 lbs if I remember, or more!
Also, watching these game this year, I always seem to see the other teams having trouble with getting physical with the Cowboys...
Every team that we have played, one or more of thier players have been knocked silly, and I think that the teams that we have not played yet really don't know what they are in for, or just how much more physical this whole team is this year!
I believe this past seasons workout routine greately increased the success of this team this year...