September is way too early to declare any team in the NFL the best, the worst or anything in between. The first two months of the season are for staying in contention, fine-tuning your team and overcoming early-season injuries.
When Thanksgiving comes around, that's when we can start talking about who's the best, who's the worst and who needs a couple of fortunate bounces to weasel their way into the postseason. Once the turkey is consumed and the pumpkin pie digested, we'll start to see the good teams make their move to become great, and average teams exposed as frauds before they fall off the face of the Earth.