Here are the Detroit Lions needs for this off-season. I believe that the most important positions in the NFL besides QB are edge rushers and Corners. On offense tackle and WR.
# 1 need Edge rusher.
A flame thrower to match with Ziggy would be ideal. Right now the starter would Devin Taylor. Taylor is best suited for rotational duty.
Top Free Agents
DaQuan Bowers
Andre Branch
Vinny Curry
William Hayes
Cedric Thornton
Olivier Vernon
Muhammad Wilkerson
# 2 Offensive Tackle
A major weakness in the Lions offense. Michael Ola was a major upgrade to LaAdrian Waddle. Ola is not very good which says a lot about Waddle. Ideally the Lions could move Reiff to right tackle and find a solid left tackle.
Top Free Agents
Byron Bell
Cordy Glenn
Bobby Massie
Russell Okung
Donald Penn
Mitchell Schwartz
Andre Smith
#3 Wide Receiver
With the retirement of Calvin this leaves a major hole. My feeling is the Lions will try to replace him with a bunch a number 2 and 3 receivers type guys.
Top Free agents
Travis Benjamin
Marvin Jones
Jermaine Kearse
Brian Quick
Rueben Randle
Mohammad Sanu
# 4 Defensive Tackle
A deep spot in this years draft. A solid guy or two for the rotation would be a upgrade. Right now Reid, Wilson, Wright and Thornton are on the roster.
#5 TE
A blocking TE to go with Ebron would be ideal. Pettigrew, Wright and Papscoe should all be gone.
Top Free agents
Coby Fleener
Zach Miller
LaDarius Green
Dwayne Allen
Daniel Fells