Watching Dr Upton giving evidence was so revealing.
Yes. Unless you have seen and heard with your own eyes and ears a witness giving evidence it is impossible to judge that evidence. That's why such importance is placed on it in our legal system. In criminal cases witnesses who are screened from the defendant are still visible to the judge, the jury and counsel.
It astonishes me how readily people who have not been in court hold forth and criticise the outcome of a trial. Unless you heard and saw all the evidence from each and every witness you are not in a position to judge.