All the guys listed below were talented players and many provided big time veteran leadership. Belichick is a great coach but this year I think he thought you could just plug in another guy and he'd coach them up. This and several poor drafts are part of the reason the Pats have struggled this year to compete with the better clubs. The organization has also been striped of assistant coaches and front office personnel. The Pats still have a great owner, Head coach and Hall of Fame QB to build around. 

Ty Law
Troy Brown
Deon Branch
Mike Vrabel
Teddy Bruschi
Richard Seymour
Rodney Harrison
Willie McGinest
Assante Samuels
Ted Washington
David Givens
Ted Johnson
Corey Dillon
Daniel Graham
J. Gaffney