I agree that ultimately talent makes a difference and fixing the O-line would go a long way toward fixing any problems. However, I disagree about the play-calling. The right calls can make a difference. I just read in Dallas Cowboys Star magazine a good breakdown on how effective Dallas has been with counter running plays (I think the author wrote that we ran six all season, which is hard for me to believe ... but we didn't run many), and how few times the Cowboys ran them last year instead relying on the dive much, much, much more. To me, this was an especially glaring issue against the blitzing Redskins in the final game. (It's also the one reason, aside from injury, I feel Felix became less and less effective the last couple of years.) Callahan might be calling from the same playbook, but he doesn't have to call the same plays. He can mix in draws and screens, more play-action passes (another statistically successful play for Dallas that was seldom-used) and even a few trick plays that Garrett for some reason seemed to forget he had in the playbook even after his team used one of those plays with success.