The AFC East is definitely up for grabs. But here are the major questions, I think for each team in the division.
Buffalo-- have they peaked? The Bills were near the bottom of the NFL in turnovers and that showed up against the better teams. They also have a new DC, one year after replacing the OC. Can anyone, other than Josh Allen, provide a running game?
Miami---can they run the football in crucial situations. And, can Tua stay healthy?
New York-- how quickly can they learn how to win? This is a team with a lot of young talent, but in the NFL you have to learn to win. Can Rodgers make the difference?
New England-- will Dan O'Brien turn around a struggling Mac Jones?
I think if they stay relatively healthy, Miami wins the division. But it's definitely a competitive division with a lot of variables at play.