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As a former offensive lineman, I can tell you there's no advantage gained by offensive linemen encroaching on the NZ... in both pass and run blocking, I'd like the extra space to give myself time to maneuver into position between the snap and initiating the block on the defender. It's one of the reasons my least-favorite position was center, and one of the reasons why most o-line alignment problems are from players lining up too far back from the NZ.
D-linemen, on the other hand, usually want to get as close to the NZ as possible, because it puts them that much closer to the QB/runner and helps them disrupt the blocker before he can get his initial steps completed.
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