It's easily Tramon.
Shields is a surprise but he's still just a nickel back and he's been burned a few times.
Peprah got the job by default and he isn't that good in coverage. Good against the run. Also it's not hard when you're assignment is basically helping out Charles Woodson or Tramon Williams and Nick Collins gets the harder one every time.
Bishop has been known to be a good thumper LB for awhile and plenty of people thought he should start instead of Hawk, or that he was at least starter caliber.
Zombo still hasn't impressed me any more than Brad Jones, Chillar, or Poppinga, he's just the last focus of the offense.
Most people thought Clifton would be good as long as he was healthy. He's never been a super athletic guy. He has a great punch move with his arms and excellent footwork. It's just surprising that his knees haven't given out.
Tramon as a top 5 corner? I believe that is completely true. He's adapted some of the ball skills Woodson has. It really showed in the Jets game where they both got interceptions that looked exactly the same. Last year most people (me included) thought he was an excellent nickel and good returner but that we should try to find someone else to play LCB and RCB. It's almost unbelievable that he's one of the most desirable defenders in the game right now being so good, experienced, athletic, and under (what I consider) a bargain contract for awhile.
Thanks to BK for the sig