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Chart: The Bills may be the NFL's worst team in the second half of the season

The Bills are still fighting for the playoffs at 7-6, but according to analytics from ESPN, they've basically been the NFL's worst team over the second half of the season.

ESPN's Brian Burke posted this graphic Tuesday that charted each team's expected points added on offense versus on defense (EPA is explained below). Offense is on the X-axis going across and defense in on the Y-axis going up and down, so the best teams are up and to the right and the worst teams are down and to the left.

The Bills are bad but not horrendous on that graph, which spans the entire season. But when limiting the data to the second half of games that have been played, the Bills take a precipitous drop.

The Broncos rank worse than the Bills on offense over the last seven weeks, and a handful of teams rank worse on defense, but no team had a worse combination of both units in Weeks 8 through 14, the graphic shows.

The Bills have three wins over than span, against the Raiders, Chiefs and Colts, but also three very bad losses to the Jets, Saints and Chargers, as well as one against the Patriots.

The span also marks the entirety of the Bills' games after the Marcell Darues trade, though the defense's struggles went well beyond Dareus' absence.

Expected points added is a useful metric that weighs the value of each play. Every situation on the field corresponds to an expected point value, given what teams have historically ended up doing from that down and distance. If a play results in a situation with a higher expected point value, the play was positive, and if it results in a lower expected point value, it was negative (and flip those around for defense). For example, a 5-yard run on first and 10 from the 20 would be more valuable than a 5-yard run on third and 10 from the same spot.

Chart: Which unit is better (or worse), the Bills' offense or the Bills' defense?

Did the Marcell Dareus trade magically fix Jaguars' run defense and ruin the Bills?

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