It’s the team with the NFL’s longest active postseason appearance streak. It’s also a playoff contender with a new sideline leader. The Buffalo Bills are now under the command of former offensive coordinator Joe Brady. This after Sean McDermott guided the franchise to the playoffs each of the past seven seasons and during eight of his nine years with the club. It’s still a very talented squad, led by quarterback Josh Allen, who now has veteran wide receiver D.J. Moore to throw to. A year ago, running back James Cook led the NFL in rushing yards. The defense had its ups and downs, especially against the run. That unit is now under the command of new coordinator Jim Leonhard. Allen and company will begin the season on September 13 against the Texans at Houston. The Bills then play three straight home games against the Detroit Lions (on a Thursday night), Los Angeles Chargers and the defending AFC East champions, respectively.…