2015 was great, but an anomaly. Peyton's physical skills were diminished, but his PRESENCE was still huge. On top of that, the defense had something to prove, and I'm pretty sure the whole franchise felt they owed Peyton a SB win after the collapse against the Seahawks after 2013 (and even the defensive collapse against the Ravens in 2012). Even the Kubiak homecoming tour probably contributed to the whole vibe that carried them through the playoffs that year.