Week 9 Rewind Sample — Kansas City Chiefs @ Buffalo Bills Built from free public data (nflverse schedules + Pro-Football-Reference season stats), 2025 regular season · not paid data

Data sources: team schedules, results & closing spreads from the nflverse nfldata project; season splits and league ranks from Pro-Football-Reference — all free, no paid odds API required.
Reading the Off/Def tags: each bar is labeled Off or Def because the two sides of a row aren't the same stat — it's one team's offense paired against the opponent's matching defense (e.g. KC's rush offense next to Buffalo's run defense), the same pairing the Edge Score above is built from.
O-Line Score is a proxy, not a PFF-style grade: it blends each team's league rank in Rush Yds/Att and Net Pass Yds/Att (which already backs out sack yardage), rescaled to 0–100. Offense Edge blends each team's rush + pass ranks against the opponent's matching defensive ranks into one 0–100 favorability score, where 50 is neutral. Note it disagreed with Vegas here — our model favored Buffalo, the market favored Kansas City — and Buffalo won outright, which is exactly why this is one data point, not a system with a track record yet.