having unanimous tesitimony means that the gaussian is too narrow to be the results of noisy testimonies. So either they gave absolutely accurate testimonies or they did something else than testify. Having them all agree raises more doubt on that everyone was trying to deliver justice than their ability to deliver it. If a jury answers a "guilty or not guilty" verdict with "banana" it sure ain't a result of a valid justice process. Too certasin results are effectively as good as "banana" verdicts. If our assumtions about the process hold they should not happen.