It’s really not complicated.
The Bronco defense was out for blood all game long. They tattood Cam Newton repeatedly and stuffed the Panthers completely. Not the first time in Super Bowl history that a dominant defense destroyed a high powered offense. The Giants did exactly the same to Tom Brady a few years ago.
Cam Newton ran his mouth to much and Von Miller decided to try and kill him. (The Toll, post #17)
& 'Twasn't only Cam's mouth...but Cam electing to perform 'Dab' TD dances on too many mere first downs in .
Cam himself motivated the Broncos!
Oh, & how ironic...In 4th qtr, a Panther was called for an unsportsmanlike conduct penalty vs. Immanuel Sanders when Sanders tried to signal first down after a catch. The Panther first knocked the ball out of Sanders' hands as he began his signal, & then straight-armed Sanders.
(So the 'Dab-man' can dabble in dab-dances, but other offensive players can't give a less showier expression?)