Give Peyton Manning time and he will pick your team apart. Even at 4-0 on the season, the Broncos offensive line has not given Manning a lot of time. They also haven't given the running backs much in the way of room to run.
Manning has always had a way of making his line look better than it is. When he feels pressure, he gets the ball out quickly, which is why despite the terrible play from Broncos tackles Ty Sambrailo and Ryan Harris, the two have given up just three sacks on the season.