The Veteran Combine isn't really for big name players.  They don't need any help getting signed to teams.  These players do.  This gives them opportunities to earn a contract.  It won't be exciting for fans, but it's a good opportunity for teams.  If they find a guy they think "hey, he's still got something left in the tank, let's give him a shot", then it's done it's job.  Of course it's still something for fans to follow between the college combine and the draft other than a bazillion mock drafts that try to predict who's going where.

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