I think this is a good point too. Despite all of the hype and all of the investments, I don't see anywhere where the Cowboys have a distinct advantage because of their offensive line. And it's nit a sign of you can just point at Joe Looney and say 'he's struggling' and that's why the line hasn't played well.
No, at various points, it's all of these linemen letting the team down, and overall as a group. People want to talk about the pass rushing of Clowney and Watt, and that's fine, and the Cowboys did struggle against that, but they also struggled to run the ball consistently which is their bread and butter right now offensively. There weren't any powerhouse run defenders out there playing for the Texans. They shut down the Cowboys run game with several no-name guys holding up against name offensive linemen.