Cornerbacks is easy...
First Tier:
1. Dominique Rodgers-Cromartie
2. Mike Jenkins
3. Leodis McKelvin
Second Tier:
4. Aqib Talib
5. Antoine Cason
Third Tier (no particular order, yet):
Terrell Thomas, Charles Godfrey, Justin King, Tracy Porter, Brandon Flowers, Reggie Smith, Patrick Lee, Orlando Scandrick.
Fourth Tier (no particular order, yet):
Trae Williams, Antwaun Molden, Tyvon Branch, Chevis Jackson, Jack Williams, DeJuan Tribble, Jack Ikegwuonu
Now linebacker is a bit harder. Are you talking about pure linebackers? Or are you talking about Rush End types?
First Tier Rush Ends:
1. Chris Long
2. Vernon Gholston
3. Quentin Groves
Second Tier Rush Ends:
4. Shawn Crable
5. Chris Ellis
6. Cliff Avril
7. Bruce Davis
Third Tier Rush Ends:
8. Jeremy Thompson
9. Marcus Howard
10. Ezra Butler
Fourth Tier Rush Ends:
11. Kroy Biermann
12. A.J. Raebel
13. Vincent Redd
14. Jonal Saint-Dic
15. Bryan Smith
As for Linebackers...
First Tier Linebackers:
1. Keith Rivers
2. Dan Connor
Second Tier Linebackers:
3. Curtis Lofton
4. Xavier Adibi
5. Jerod Mayo
Third Tier Linebackers:
6. Erin Henderson
7. Jonathan Goff
8. Gary Guyton
9. Phillip Wheeler
10. Tavares Gooden
11. Geno Hayes
12. David Vobora
Fourth Tier Linebackers (no particular order, yet):
Beau Bell, Vince Hall, Ben Moffitt, Jordan Dizon, Wesley Woodyard, Bryan Kehl, Larry Grant, Stanford Keglar, J Leman, Spencer Larsen.