I think the Bills are the class of the AFC, but the Eagles still have to compete with Tampa and Green Bay whenever they hit their stride. And they will, Tom and Aaron don't underperform for long. They'll get it figured out. The Rams are off to a rough start, but they will bounce back, too. Also, I think the Eagles are like Dallas in that they will cup/sniff their own farts and buy into their own hype for a few weeks. They will probably be in the mix, but when it comes playoff time, Brady, Rodgers, Stafford will sit them down.
Currently the Bills are the best team in the league. They have defense and Josh Allen is nearly unstoppable. He has one of the biggest arms in the league (if not the biggest) and the only AFC team that can keep pace with him is KC. Maybe the Chargers because Herbert is capable too when he isn't injured.