I don't think so millie. If he knew the questions being asked, he wouldn't have fumbled so badly on some of them. He'll have likely been given some rehearsal with his own legal team, which would include an overview of what was likely to come up, and that does some to show in parts.
There's no real need to chase some questions down. Jackson was there primarily to establish that the GB were in charge and to try and find the extent of their ability to compromise on potential recommendations. He was asked to accept that child abuse is a problem within JWs, and even amongst those with a position of responsibility, so I think the commission, based on their own reading of the evidence they have, are aware of the problems - that was also highlighted in the questioning of Applewhite (Stewart asked her to agree that once that boundary had been crossed, there was a huge risk factor that re-offending would occur in the future). Think the submission from counsel for the commission, with the potential recommendations, will clarify the procedures they will expect to be put into place to prevent it happening.