ORCHARD PARK, N.Y. — Josh Allen recorded the greatest season by a quarterback in Buffalo Bills history. He powered the team to its first A.F.C. championship game in nearly three decades, and after losing to Kansas City, he left Arrowhead Stadium that January night knowing the Bills would be back.
Allen allowed himself a few weeks to decompress from the longest, best and most disappointing year of his young career, and when he was done, a week or two into February, he visited a sock company. There, on the basketball court at Stance headquarters in Southern California, Allen set about refining what his personal quarterback coach, Jordan Palmer, characterized as a “very, very specific” mechanical inefficiency.