INGLEWOOD, Calif. — In the days leading up to Denver’s win-and-in, prime-time tilt against the Chargers on Thursday night, Sean Payton and the Broncos knew several things about the state of their run game. First, they’d lacked consistency this season. Second, they’d need it down the stretch to get where they’re trying to go. And, finally, they’d be operating without Jaleel McLaughlin (quad) when they took on Jim Harbaugh’s team. The numbers coming in weren’t pretty. Over the previous five games, Denver averaged 84.9 rushing yards per game. In that span, Javonte Williams rushed nine times for 59 against Atlanta, but in the other four he totaled 15 yards on 19 carries. The anemic production hadn’t hurt Denver badly — they had every chance to win at Kansas City in Week 10 and then won four straight — but it lurked as a potential problem. Payton put his aim in bold print.