1) Due to injuries cowboys wont fulfill their hope of being first team to play SB in their own stadium, let alone win it. These might not be season ending injuries, but just 3-4 game type of injuries that prohibit consistant performance.
2) Same reason, Cowboys might not win the division, even though, when healthy by far the best team in division.
3) To surpise of many distractors, Roy Williams will have a good season, i.e. somewhere in 800-900 yards and 8-9 TDs.