The Cowboys are legitimate contenders. They are one of a few teams that have a real chance to go all the way. Ignoring injuries and the QB, here are my concerns:
1) Offensive line. Important for any team, but perhaps even more so for Dallas. This unit is no longer elite, and has injury concerns now. Management failed to significantly address this in the draft, a mistake IMO.
2) Running Back. Can Pollard can return to his old form? Can he carry the load for a whole season? Big questions, and there's nothing behind him that inspires confidence. Seems like a big drop off if Davis or Jones has to assume the lead role. Management should have devoted more than a late 6th to this important need.
3) Kicker. The kicker is going to decide some games, and might be the leading scorer on the team. This almost seems like an after-thought for the team.
4) TE. Dallas lost a proven, productive TE in Schultz. It's far from a certainty that his production will be easily replaced. Dak & Schultz worked very well together.
5) Offensive Coordinator. Dallas lost one of the highest rated OC's in the league. Now MM wants to just run the ball. Who knew it was that easy? When the offense is racking up points, it makes the job of the defense so much easier. They can pin their ears back and attack. Grueling close low scoring defensive battles will not serve this defense well, given their struggles against the run. There is the significant possibility that Dallas took a big step backwards in play design and calling.
I'll repeat, Dallas has a chance to win the Super-Bowl- but those are the things I worry about.