The Detroit Lions have a few real positions of need in this draft, and those are clearly the offensive line and the secondary.
However, they also need to add depth at other positions, and defensive end falls into this category.
Plenty of mock drafts have the Lions making a move for a pass-rusher in the first round, with Courtney Upshaw and Whitney Mercilus both being mocked at No. 23. The Lions probably will have more pressing needs and more valuable players available in the first round, so I do not think the Lions will really take one of them.
However, in the third round it will be a different story. The Lions will have dealt with some needs in the earlier rounds, and may even have two third-rounders if they trade back in the first or second round.
With a third-round pick, the ascending Tyrone Crawford will probably be ready to be picked, and he would be a great addition to the Lions' defensive line rotation.
In the following slides I will run through his strengths and weaknesses, and give the reasons why the Lions should definitely target him aggressively in the middle of the 2012 NFL draft.