Think could be a pretty big deal. If it pans out it will help the defense next year with Perry, Gay, and Carney all leaving. Avery/Brown sounds like a pretty good DT rotation, and Coleman/Cooper at OLB would be great if he can add the required size/strength.
ILB should still be in decent shape with Barnes, Hart, and Tolson
OL seems like it could be concerning given the amount of transfers and Brown switching, but we did start off with a ton of lineman on the roster, and if you look at where Tyler, Sparks, and Jones all ended up, chances are they wouldn't have contributed significantly any time soon. BB must feel good enough about the players he has left or his ability to convince some OL talent to transfer in next year.