"Peyton Manning comes in off the bench in relief"- who thought we would hear that? Manning replaced Osweiler in the third quarter against San Diego. He didn't pass much (about 50 yards worth) but while he was in Denver came from behind to win the game. They had six turnovers while Osweiler was in. Thanks to Miami beating the Patriots Denver is now the #1 seed and gets a chance to rest players and get them healthy before their next game.
Steelers made the Wild Card by winning and the Jets losing. Had Denver lost, they would have been the bottom Wild Card team since Steelers own the tiebreaker (head to head). Vikings beating the Packers gave themselves their division title.
Who wins in the playoffs probably depends on who has the healthiest players. Bengals Andy Dalton is still listed as out for their game against Pittsburgh so could be "one and done".
Pittsburgh loses because their #1 RB will sit. Cincy was promised a playoff win this season. Bet on it. Any team whose #1 RB sits will lose their playoff game, whether genuine injury or just part of the script. Learned that lesson last season...