From what it seemed, we need 2 guys in Snow's scheme for most downs, not 3 like we're used to. You've got some nice points.
A main honcho, sideline-to-sideline guy at one spot. We just don't really have a lead man reading the offense.
Then an athletic outside type, covering the seam like you say. But needs to still handle the physicality of roughing it up with linemen. Shaq was kind of in between the types.
We've got Chinn as that rover type in those packages.
Don't know if it's a 2nd or 3rd rounder (or later) but we need some help. I think Carter could be decent but there's a big issue. I think a big concern last year (as much as the lack of pressure) was not having a smart duder in the center of that D. We don't need to find a Kuechly clone, but it would be nice to find a guy that can create the awareness of an offense changing things up on a 3rd and mid.
They went thru a stretch where they couldn't force a punt, but they were definitely better in the second half of the season than the first. Still not great, but definitely improved.
The defense this year was significantly better than last year, although that is not saying much.