This is why threads like 'can't stop the Ravens' are chicken little crap. In the playoffs it's high competition, where not bringing your A game, where being unable to figure out and put in adjustments, where an opponents shifts to another gear, many things can send the favorite home.
That's why even for the Patriots (what may have been), as bad as they looked, they win just one game at a time in the playoffs, just convert a single FG against Tenn to win, then worry about what happens next week. IMHO is doing just that, one game at time.
Has any all road team beat the #3 seed, #1 seed and #2 seed to get to the SB? I'm assuming (IF KC wins) if Tenn can beat KC they'll have pulled off that pretty rare accomplishment.