Getty Wide receiver KC Concepcion The Buffalo Bills entered the season with Super Bowl expectations. Instead, after 10 games they find themselves at 7-3, 1 1/2 games behind the surprising New England Patriots in the AFC East, occupying the No. 5 seed in the conference just two games above the out-of-the-playoffs zone. What’s going on? The reasons for Buffalo’s underperformance are complex and varied, but one aspect of their game stands out as particularly lacking — the passing attack . How the