I think that, insofar as the OL is concerned, everybody is forgetting the importance of reps. The line, last year, had less than a year with this staff when the season started. They had a lot of experience, but under how many O line coaches?
This O line, the C, LG, LT, and RT have been in this system for nearly two years and have played. Robertson is a freak from a great HS program. The O line has been working with these TBs and the QBs as well...etc.
OL will not be a problem.
As for the D, and the DL, well the ends are stacked. We have Maggitt, Vereen, Barnett, Hendrix, Miller, Vickers, Weatherd is passing downs. That is much more than we had last year, and LB and the sec are much,much improved from depth and talent.
DTs are a concern, but again it's not that they havent played.