Surprise, surprise. Since the start of the 2021 season, the Cincinnati Bengals have won 19 of 31 games, including three playoff games. Their quarterback is the biggest reason why. Joe Burrow has elevated into the upper echelon of quarterbacks since his second season began last year. And when the protection in front of him holds up, there might not be a more productive passer playing. Courtesy of ESPN producer Paul Hembo, Burrow ranks first in the NFL in completion percentage, yards per attempt, first downs per attempt, and passer rating when the Bengals’ offensive line collectively beats their opposition. No…