It is very difficult to predict things in the NFL. After all, who saw the Dallas Cowboys beating the Tampa Bay Buccaneers in comfortable fashion? Obviously the end was hardly comfy, but Dallas was in control for most of the game that they wound up winning.
It was the second week in a row in which the Cowboys won as underdogs which proves that trying to predict what is going to happen with them, or any NFL team for that matter, is an inexact science. It is worth noting that oddsmakers not only incorrectly predicted the Cowboys to lose last week, but statistical projections for them were also quite off of the way things turned out.