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David Quinn/Associated Press

Now is not the time to debate the value of cornerbacks. The Chicago Bears' Kyle Fuller was the exception to the rule that cornerbacks take at least a year to develop into consistent contributors. The position doesn't have a place in the instant-contribution discussion.

As for running backs, there are two first-rounders that have the ability to be Day 1 starters. However, there's no guarantee that Todd Gurley bounces back right away from his ACL tear, and Melvin Gordon struggles with ball security (six fumbles lost last season).

Therefore, the best route is a versatile offensive lineman who can start right away, and fellow Bleacher Reporter Ryan McCrystal thinks that guy is La'el Collins. I agree.

La'el Collins - Immediate starter at G and possible a very good one. Capable of playing in any blocking scheme. http://t.co/YFppd5Lpr3 — Ryan McCrystal (@Ryan_McCrystal) March 23, 2015

Collins is the exact type of player the Lions need up front. He's a strong run-blocker who will drive a defender to the second level. He will instantly make the offensive line edgier due to his nasty streak, and if you're concerned about his pass protection, just see what he told NFL.com's Chase Goodbread:

I feel like I played him as good as anybody. He definitely made me better. When you go back and watch my film against him, he's a top-five pick and I feel like I held my own. If you have any questions about my pass blocking, just go watch my tape against Florida.

Florida State's Cameron Erving would be a solid pick here as well. But Erving's best position is center, and Detroit plans on playing Travis Swanson there. This pick will let Detroit put the best player available in the best possible position.