they have incredible talent on D , playing in an incredibly weak division, and playing what analytically plays out as the easiest schedule in the league.
https://www.predictionmachine.com/strength-of-schedule
I had a nice ticket on them to win the AFC last year! So yes, Marrone has done a nice job, but not the miracle worker he will be painted as.
BTW, had a small ticket on the Browns to win this North this year, maybe time to pounce on them next year!