I'll probably get killed for this but:
Channing Crowder.
He led the team in tackles in 2007, was 2nd in 2008, and 6th in 2009 despite only playing in 13 games. Everyone always knocks on him, because he's not a pro bowl ILB like we had for years in Thomas... but to be honest, for what he does and how cheap his contract is, I think he's pretty underrated. In fact... in 2008, he finished just with just 6 less tackles than Dansby, even though he played in 3 less games.