The Denver Broncos just allowed 60 points to their opponents at home in Weeks 15 and 16. That is simply not something that can happen again if the Broncos hope to go far in the playoffs, as the offense is clearly not always going to be able to pick up the slack.
And it's not that the offense can't, it's that the unit is clearly missing a go-to pass-catcher and is also missing their starting running back. The defense regressing late in the season is not a new thing for the Denver Broncos, unfortunately.
Vance Joseph's unit did this same thing in the 2024 NFL Season, and unless something major changes, Denver will again go one-and-done in the playoffs.