It's been excruciating watching teams chip away at the middle of the field, but the biggest problem in the great safety dearth between Collins and HHCD has been the atrocious play on deep passes. Early signs point to that being less of a problem this year. Actually, Waldo before he had a kid and checked out had a good theory about failure at all 3 levels up the middle. GB's back line looks like it's been solidified.
As for the LBs and DL.... well, yeah, those need some shoring up yet.