After going 12-5 but missing out on the Super Bowl, the Buffalo Bills decided to make some big changes. Head coach Sean McDermott was fired after nine strong seasons and offensive coordinator Joe Brady was promoted to the position. Buffalo then signed Jim Leonhard to coach their defense , signaling a major shift in scheme. Throughout the offseason, they worked on getting players to fit Brady and Leonhard's vision, and overall, the work has been solid. There are critics who believe they overpaid for veterans such as wide receiver DJ Moore and EDGE Bradley Chubb, but those two make the roster better. General manager Brandon Beane also took heat for trading out of Round 1, but overall, he did well with a draft class led by T.J. Parker . That said, there are still a few areas of concern as the Bills prepare for another season of chasing after their championship dreams.…