The Denver Broncos won 14 games in the regular season, which tied a franchise record. The team clinched the AFC's top seed with a less-than-inspiring Week 18 victory over the LA Chargers, but it was pretty clear that Denver's game plan on offense was vanilla on purpose.
The Broncos may think the Chargers could return to Denver for the Divisional Round, so emptying the playsheet and trying to blowout a team resting starters was not going to be a wise idea. Heck, Denver seemed to do that in Week 18 last year, and they then proceeded to get blown out in the Wild Card Round.