The Browns were high on him a few years ago and since an injury 2 years back hasn't been consistent enough. His flaws in shedding blockers also would be magnified with no really good D-Lineman to take the pressure off and allow him to run. He is what I would call a Low Risk- High Reward signing that wouldn't cost the team much.
Here's the scouting report from scouts inc.
Full Name: Chaun Thompson
Born: May 22, 1980
Mount Pleasant, TX
Height: 6-2
Weight: 255 lbs. Age: 27
Pos: LB
Experience: 5 years
College: West Texas A&M
Drafted: Year:2003 Round:2 Pick:20, Browns FANTASY
Percent Owned: (Week +/-):
NFL: 0.0% (0.0%)
Avg. Draft Position:
NFL: Undrafted
TACK 21.0 | FF 0 | INT 0
Profile Stats Splits Game Log News Scouting
2007 Scouting Report - Scouts Inc.
Grade: 57 | Key
Alert: TM
Comment: Thompson has good size, speed and in-line explosiveness. He is somewhat versatile. He has played outside linebacker and now aligns inside. He is a playmaker who has untapped ability. He is a high-effort defender who can pursue and chase down plays from the back side in the run game. He can make quick reads and disrupt plays before they gain any momentum. He has enough functional strength to set the edge on the outside. He can bend the edge and close with a burst to the quarterback. He is a valuable kickoff cover guy who can blow up a ball carrier. But Thompson has a lot of holes in his game. He isn't a very good take-on player. He prefers to slip blocks and isn't very explosive or technically sound in stack-and-shed mode. He lacks fluidity and struggles to flip his hips in space. He makes occasional jaw-dropping plays, but not consistently. He doesn't pick things up quickly.