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. Joe Brady and Josh Allen | Shawn Dowd/Rochester Democrat and Chronicle / USA TODAY NETWORK via Imagn Images It’s still a very talented 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. These days, the Bills are now chasing the reigning conference champion New England Patriots in the AFC East. General manager Brandon Beane bolstered that aforementioned defense in free agency, and with six of the club’s 10 draft choices .…