DL - The defensive line isnt spectacular, but its solid, with some decent adds in free agency. I need to see it gel, and I need to see a good pass rush in preseason, or its going to be a long year. B+
LB - Nothing to worry about here at all. Ware and the boys are going to get it done this year, and the future looks bright with Sean Lee and the draft picks this year. A+
DB - Here is the killer. Jenkins had a bad year, Sensabaugh found out he wasnt that coveted and is back on a one year deal, Newman is old and hurt, and the Boys didnt get Michael Huff or anyone else to bolster the group. They are not going to match up well talent wise against the Giants or Eagles skill guys. C- for this group.
Overall for the D I give them a C+ because of the secondary and questions along the line.
Now to answer the last part...yeah, a scheme suited to the strengths of the guys running it can overcome some physical limitations. The problem is we arent playing in the NFC West. Hakeen Nicks, DeSean Jackson, and Jeremy Maclin are guys who will expose a scheme and deficient athletes.
This year is about seeing who wants to be around and who will perform, and its about getting the right culture back in the locker room and Garrett making this HIS team. The rest of the division has improved so much Dallas may be a better team and it wont show up in the win column. What you are looking for this year is Dallas fighting hard in every game and not giving in. Expect 7 or 8 wins for Dallas this year.