Non-Needs
Running back and Fullback
No questions that running backs D’Andre Swift and Kerryon Johnson will be the duo in Detroit for now. The real issue is with depth, which could be found in the last wave of free agency or the later rounds in the draft. Injuries have been a problem at this position and they should prepare for it.
If the Lions offense remains full-back heavy, Jason Cabinda is a reliable option and a restricted free agent.
Tight End
Outside of tight end T.J. Hockenson, there are question marks at the position group. If the Lions continue to use 12 personal or jumbo packages, they could benefit by bringing in another player at the position who excels at run blocking.
Left Tackle, Left Guard, and Center
As previously mentioned, Decker, Jackson, and Ragnow are in place as starters. Depth along the offensive line will be something to pay attention to.
Cornerback
Despite an uninspiring season from rookie cornerback Jeff Okudah and inconsistency from cornerback Amani Oruwariye, the Lions owe it themselves to see what they have in these guys as the starters. With an improved pass rush, their play could improve substantially.
Slot corner Justin Coleman could be released to free up cap space, but it might be a smart idea to hold on to him where there could be more flexibility in the future. Lastly, I believe cornerback Desmond Trufant is likely to be traded or released.
Recap
Major Needs: WR, RG, DT, MLB, OLB, S
Potential Needs: QB, RT, DE/EDGE
Non-Needs/Only depth needed: RB, TE, LT, LG, C, CB