I agree that we have to get middle of the D fixed. I think its more than just that, because the LBs leave a lot to be desired and the safties are OK, not great.
the offense is going to come down to progress of Guyton. I am not worried about middle of the OL, as its strength of offense IMHO. I am not happy about Steele and been talking about him for two years. he hasn't been the same since his injury and for two years he has sucked, he has zero lateral mobility, but we are able to cover some of his warts with TE on the strong side. but if Guyton doesn't make a drastic jump and that's rare, then the passing game is going to suffer. with CD, Pickens and Turpin, we have players who can get deep, but if the QB only gets 2 seconds to throw, then its not going to work. I am sure somebody is going to read this as a defense or excuse for Dak, but that's not the intent.
Guyton's play is going to determine the offenses success, because its based on passing game and passing game requires a LT to protect the blind side of the QB and go up against the defenses best pass rushers.