Why they're here: Buffalo has been a clinic in roster building that I believe teams in all sports should admire. GM Brandon Beane and coach Sean McDermott laid the foundation of their culture while meticulously gathering playmakers. Their conviction on a raw but massively talented quarterback in Josh Allen in the 2018 draft paid off, with Allen's rise matched by a roster littered with talent. -- Yates
Biggest worry: The 2021 draft selections on the defensive line of Greg Rousseau and Boogie Basham have to be big hits for Beane and McDermott if they want to knock the Chiefs off the AFC throne. Defensive end Mario Addison tied for the team lead with just five sacks in 2020 but is 33 years old and will be an unrestricted free agent in 2022. Jerry Hughes, 32, was second with 4.5 sacks and is also a pending free agent. -- Riddick
What could change for the better: Buffalo's hit level on free agents and high draft picks bodes well for the future under Beane. Five of the top free-agent signings or trades in recent years -- Stefon Diggs, Cole Beasley, Daryl Williams, Jordan Poyer and Mitch Morse -- are key contributors. Top picks from 2017, Tre'Davious White and Dion Dawkins, are locked up long term, and 2018 high picks Allen and Tremaine Edmunds probably will be shortly. Buffalo's roster is in trusted hands. -- Fowler
Stat to know: Buffalo led the league last season in first-down dropback rate (67%, excluding garbage time), and it paid off, as they ranked second in offensive efficiency. Assuming they keep it up, that aggression will continue to pay dividends. -- Walder