Belichick is in the Phil Jackson category, (Phil Jackson only won one COY award despite winning 11 NBA titles) he builds a successful team every year so voters tend to look for something fresh or news worthy like last year, Bruce Arians took over for the Colts after Chuck Pagano was diagnosed with cancer and the Colts ended up finishing 11-5. This year after starting 1-3 for the third season in a row, most pundits thought that Rivera would surely be fired during the offseason or even mid season. Rivera turned it around and went 11-1 to end the season and beat quality opponents during that stretch. Andy Reid was the frontrunner a month ago but the Chiefs did not beat any quality opponents and they lost 5 of their last 7 games. Chip Kelly is interesting because he was a college coach and led the Eagles to a division title but the Eagles like the Chiefs always had talented players, they just needed a coaching staff to utilize their talents properly. Rivera started from scratch, he had to draft his franchise quarterback (Cam), build his defense (drafted Luke, Short, and Star), and develop talented players like Greg Hardy.