I think their over-hyped reputation hurts them... Defensive-Linemen don't gear up to play the Cowboys the same way they gear up to play other teams, they gear up with the mindset of taking down the "best OL in the NFL"... It's like last week against the Dolphins the broadcasters were talking about how they asked Suh something to the effect of, "What's it like going up against the best Guard in the NFL (Zack Martin)?.... and Suh's reply was something to the effect of "I don't know if I'd say he (Martin) is actually the best".... How many times have we heard that Tyron Smith is the "best OT in the NFL, and how many times do we have to see him get destroyed by a speed rush before that myth goes by the wayside? I feel like the over-hyping of the OL started around the time that Demarco's 100-yard game streak got started early in the 2014 season, but about halfway through the 2014 season, I started to notice a steady drop-off in consistency from the OL...
I think losing Callahan hurts a little, I mean he's a guy who was head-coach of a team that went to the Super Bowl, so he's a pretty nice addition to any coaching staff... However I think the real issue is that the OL has been overrated since the beginning of their hype... Their reputation should be of an OL that can be dominant at times in the running game, but can also struggle mightily in pass-protection...