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Those problems with dual are from those not doing it well. If by three-person system you mean diagonal, that's mainly a one-person system; unless they are exceptional. The real best coverage is triple (double-dual) which overcomes the dual problems you mentioned and allows the end refs to get close to play near the goal line.
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Officiating takes more than OJT.
It's not our jobs to invent rulings to fit our personal idea of what should and should not be.
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