I think it's important to remember that, again, what appears on paper or what we see on a video can't tell us whether or not there is collusion between the parties. It can't tell, as Professor Silver says, whether or not it was first-hand information or something they heard from someone else that they haven't clearly articulated in that witness statement. There are a lot of benefits that can be explored by the preliminary inquiry in asking these questions that can't necessarily be answered on paper.
On September 24th, 2018. See this statement in context.