The easier answer would be the Kansas City Chiefs, who started the season at 1-5, but it's hard to overlook the 10-game win streak that secured the fifth seed, even though only two of those 10 wins came against fellow playoff teams. So if not the Chiefs, then their opponent, the Houston Texans, right? (If for no other reason than the simple fact that they got here by way of the lowly AFC South, and even that was a challenge.) Not in this case. Traditionally, one-and-done is reserved for a team that is actually playing in the opening round of the playoffs -- rather than watching from home after earning a bye and the No. 1 overall seed in the conference field -- but when I look at the Broncos' on-field production and situation as a whole, it paints a different picture.
First off, the Broncos lack an overall identity. They hired Gary Kubiak to run his style of offense, but it was clear from Day 1 that scheme wasn't going to gel with the aging Peyton Manning. Just when they were finally turning over the offensive reins to the Manning style we have grown accustomed to, he goes down with a foot injury and the team reverts back to Kubiak's system with Brock Osweiler under center. At one point, Denver looked like a team that could win big with a dominant defense, but the Broncos were missing the other part of the equation: a solid rushing attack.
Secondly, and most importantly, the Broncos are the worst team in the 12-team playoff field in a stat that I put a lot of weight in: toxic differential. In simple terms, the stat combines the team's ability to earn and stop explosion plays while also creating takeaways and limiting turnovers. The Broncos are one of just three teams to qualify for the playoffs with a negative toxic at -4 -- 39 points behind the playoff-leading Bengals at +35. This will haunt Denver, no matter who the opponent is in the Divisional Round.