I'm not wrong the offense costed some of those games. But its by far not the big problem with this team. They just need to fix why they didn't show up for almost half the games.
Offense doesnt show up every game. Sometimes you play great defenses, sometimes you play in bad weather, and other times things just dont go your way. Turnovers, calls, ect.....ect... Sometimes you just arent good enough. Sometimes your young OC or HC gets out coached by a better coach.
The best teams can win in different ways. Defense, special teams, coaching. These 3 items are where the Cowboys are sorely lacking.
Cowboys were actually #2 in the NFL in yard differential. For example, Ravens were #1 and KC was 10th.
Problem with the Cowboys is that they usually lost the field position battle. Not many defensive turnovers to put the offense in short field for easy scores. Defense rarely scored.
Cowboys would drive 60 yards and miss a FG or have a bad penalty and kill a drive.