It’s no secret that the Chiefs, once firmly in control of the AFC West, have been on a downward trend lately. But according to this article by fivethirtyeight.com, Kansas City’s collapse has been the worst in the history of the league.
538 uses a rating system called the Elo rating to determine team rankings and win probabilities. The Elo system doesn’t just look at the current season, but goes back several years and looks at a large sample size of team performance. This makes it more reliable and less likely to have knee-jerk reactions to the bumps in the road teams normally go through, or to sudden success after long periods of being awful (think 2016 Raiders).