Monty Baker's lawyer had questioned DeRooy about if he had not read the statements because they would be viewed as apostate material.
That was a critical question - the elders have been coached heavily - probably heavily indoctrinated with Bible verses that tell them not to betray their brothers, and not to listen to those who speak out against Jehovah. it is all those stupid Bible indoctrination scriptures that are getting in the way of the testimony. The ones on how to view apostates and such, keeping the congregation clean, etc.
They "don't recall" when it might be construed as "turning in your brother" and they don't read the statements because they have been counselled "not to listen to those who lie about Jehovah's organization".
The JWs have been coached as to which bible principles to follow when testifying. And to follow the bible law. They have no concept of "truth". They may not have read the statements, but it is pretty obvious that they have been told what is in them and how to respond to key parts of the victims testimony. And which bible verses to keep in mind.
Maybe that is what the hand signals from the WT lawyers mean - maybe they signal certain bible principle to follow, key bible verses that apply to that part of the testimony.