Biography: Four-year starter who broke into the lineup at right tackle as a true freshman before moving to the left side as a sophomore. All-Conference selection the past three years.

Positives: "Tall, relatively athletic tackle prospect who comes with a high upside. Keeps his feet moving throughout the action, displays better than average footwork off the edge, and is effective in pass protection. Moves well about the field, easily slides out, and fights hard to finish blocks. Adjusts to defenders, blocks with good lean, and easily holds the point. Shows good quickness, stays square, and is an effective position blocker who seals opponents from the action. Turns defenders off the line run blocking and uses his long arms to push opponents from their angle of attack. Makes good use of angles, keeps his head on a swivel, and works well with teammates."

Negatives: "Just average blocking in motion. Must improve his blocking balance. Overextends into blocks, adversely affecting his ability to finish the play."

Analysis: "Castonzo has been a terrific tackle on the college level and offers the size, athleticism, and blocking fundamentals to eventually start at the next level. He should be given a chance at the all-important left tackle position before any consideration is given to moving him to the right side."

Projection: 1st