This is an interesting comment, and I thought I'd try some comparisons.
Code:
NAME W L T SRS MOV SOS OSRS OMOV OSOS DSRS DMOV DSOS
-----------------------------------------------------------------------------
KC 12 4 0 9.14 8.94 0.20 5.48 5.48 0.00 3.54 3.46 0.09
DAL 8 8 0 5.29 7.06 -1.77 2.58 4.42 -1.84 2.64 2.64 0.00
The teams are comparable on defense, within 1 point of each other in DSRS, but KC is three points better in OSRS (OSRS is a defense adjusted points scored per game stat).
Code:
Rank Team Median GP W L T Pct Pred SRS MOV SOS
------------------------------------------------------------------------
6 KC 7.0 16 12 4 0 75.0 73.2 9.14 8.94 0.20
14 DAL 3.0 16 8 8 0 50.0 68.9 5.29 7.06 -1.77
This is the more telling set of data. Pythagorean expectation is that a team that scored like Dallas should have won close to 70% of its games, and instead won 50% of this game. This delta is almost a record in the modern era for underperformance. Not necessarily my own observation, as Aaron Schatz saw it with DVOA expectations as well and reported it on twitter.
D-