Getty Head coach Sean McDermott and Josh Allen #17 of the Buffalo Bills stand on the sidelines during the national anthem prior to an NFL football game against the Las Vegas Raiders at Highmark Stadium on September 17, 2023 in Orchard Park, New York. (Photo by Kevin Sabitus/Getty Images) Buffalo Bills quarterback Josh Allen had just one head coach for his entire NFL career, joining Sean McDermott one year after the Bills broke their 17-year playoff drought and turning the franchise into