More than any other one-on-one matchup, this could be the struggle that decides the outcome of Sunday's game. In the absence of Menelik Watson, Billy Turner and Donald Stephenson, the Broncos must rely on Allen Barbre to fill in at right tackle and protect Trevor Siemian. It certainly won't be easy, though. He'll be tasked with blocking Melvin Ingram, who has recorded 7.5 sacks through six games this year. And if Ingram swaps over to do battle with Garett Bolles, Barbre must combat the equally talented Joey Bosa. Should Barbre find a way to keep Siemian upright, the Broncos will have the chance to pass the ball with success and move the ball down the field. But if there's one area in which the Chargers could find an advantage, this may be it.