Which NFL Rookies Have the Most to Prove in Training Camp?

With NFL training camps right around the corner, which rookies have the most to prove?Can Marcus Mariota help turn around the Tennessee Titans? Which offensive lineman will have a lot of pressure on him as an instant starter? Did the Dallas Cowboys get a second-round steal?Watch as Stephen Nelson goes in depth with Bleacher Report NFL Analyst Chris Simms in the video...

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