So, some defensive players have changed teams.

There are a lot of them. Considering that there are ALL of the positions to go through. They don't get broken down as the offense does. So, I am going to start with the big names. My preference I guess but I will try to remain as unbiased as possible.

CB - Derrelle Revis went from the Jets to the Buccaneers.
DB - Charles Woodson went from the Packers to the Raiders.
S - Ed Reed went from the Ravens to the Texans.
LB - Paul Kruger went from the Ravens to the Browns.
DE - Elvis Dumervil went from the Broncos to the Ravens.
DE - Cliff Avril went from the Lions to the Seahawks.
DE - Dwight Freeney went from the Colts to the Chargers.
DE - Osi Umenyiora went from the Giants to the Falcons.
CB - Nhamdi Asomugha went from the Eagles to the 49ers.
CB - Brent Grimes went from the Falcons to the Dolphins.
S - Glover Quin went from the Texans to the Lions.
S - Adrian Wilson went from the Cardinals to the Patriots.
CB - Tracy Porter went from the Broncos to the Raiders.
CB - Bradley Fletcher went from the Rams to the Eagles.
DT - Chris Canty went from the Giants to the Ravens.
LB - James Harrison went from the Steelers to the Bengals.
LB - Shaun Philips went from the Chargers to the Broncos.
CB - DJ Moore went from the Bears to the Panthers.
DT - Glenn Dorsey went from the Chiefs to the 49ers.
CB - Dunta Robinson went from the Falcons to the Chiefs.
S - LaRon Landry went from the Jets to the Colts.
LB - Philip Wheeler went from the Raiders to the Dolphins.
CB - Cary Williams went from the Ravens to the Eagles.
CB - Dominique Rodgers Cromarite went from the Eagles to the Broncos.
LB - Connor Barwin went from the Texans to the Eagles.
S - George Wilson went from the Bills to the Titans.
DT - Desmond Bryant went from the Raiders to the Browns.
DE - Michael Bennett went from the Buccaneers to the Seahawks.
CB - Sean Smith went from the Dolphins to the Chiefs.
LB - Dannell Ellerbe went from the Ravens to the Dophins.
DE - Jason Jones went from the Seahawks to the Lions.
CB - Derek Cox went from the Jaguars to the Chargers.
DT - Terrence Knighton went from the Jaguars to the Broncos.
LB - Victor Butler went from the Cowboys to the Saints.
CB - Keenan Lewis from from the Steelers to the Saints.
DE - Daryl Tapp went from the Eagles to the Redskins.
CB - EJ Biggers from from the Buccaneers to the Redskins.
CB - Chris Owens went from the Falcons to the Browns.
DT - Vance Walker went from the Falcons to the Raiders.
CB - Greg Toler went from the Cardinals to the Colts.
DE - Lawrance Jackson went from the Lions to the Vikings.
DT - CJ Mosley went from the Jaguars to the Lions.
DT - Sammie Lee Hill went from the Lions to the Titans.
LB - Manny Lawson went from the Bengals to the Bills.
CB - Antoine Winfield went from the Vikings to the Seahawks.
CB - Aaron Ross went back to the Giants from Jaguars.
CB - Antoine Cason went from the Chargers to the Cardinals.
S - Michael Huff went from the Raiders to the Ravens.