Coach Sean Payton raged at Vance Joseph on the sideline in Buffalo. But even after the Bills stampeded the Broncos in the second half of a 31-7 loss at Highmark Stadium on Sunday, the 35,000-foot view still tells us the defense is not Denver’s problem. If the Broncos are going to take the next step in the AFC, they will go only as far as Bo Nix takes them. That means they should be a Super Bowl contender next season.