I wonder if the front-back case is the top-most red dot. This would be explained if the front person was innocent and the person behind them copied. Not having

I wonder if the front-back case is the top-most red dot. This would be explained if the front person was innocent and the person behind them copied. Not having the benefit of collusion, they have more shared wrong answers. Also, they have less answers in common overall, which supports the non-collusion theory.