I think to the average person outside of the JW world, Jackson appears as you say, steve2. He certainly didn't bumble around as much as the elders. It was apparent though that he did not give direct answers to some of the questions asked of him. The Royal Commission knows this.
But knowing what goes on within the religion, knowing that these GB 'fellow workers' autograph Bibles and are definitely elevated above the role of 'fellow worker' says Jackson attempted to downplay the GB's importance to the public and Royal Commission when in fact, they are and have stated they are, God's Sole Channel of Communication. This is not a mere 'fellow worker' type role. Jackson is a liar. And the Royal Commission knows this.
GJ attempted to display a humble and Biblically knowledgable appearance, but was not convincing to me. He could not give any scripture that stated only men should be Judges for example. This is a to-do for the Watchtower to get back to the Royal Commission on. I do not think he/they will be able to do it. There IS a scripture that clearly states women can be judges in, what d'ya know, Judges 4:4-5 where Deborah sat in judgment in Israel.
As I have felt all along, their use of the Bible and their interpretation is where they falter, as do all religions because they have an agenda which is also flawed. He kept saying that taking scripture out of context is where secular people have issues. So who says the Watchtower is taking scripture in the correct context? And what if scripture is flawed/incorrect/inaccurate/contradictory/illegal? What if there is no scripture for an issue they are facing? How can one determine what to take literally versus allegorically versus false? Believing that all scripture is inspired and from God is a foundational flaw. But I bet Jackson has never conducted a comparison of the 4 Gospels. I wonder if he read Bart Ehrman's book "Misquoting Jesus" what his reaction would be (I can pretty well guess).
GJ also stated they do not go beyond what is written. This is also a lie. Some, if not all, of their key doctrines do this. No where in the Bible does it state that you cannot celebrate birthdays, Christmas, Easter, Thanksgiving, etc. No where in the Bible does it state handing out Awake! and Watchtower magazines is the definition of 'works'. No where is the term 'Governing Body' used. Hell/Hades is definitely Biblical and they have chosen to not believe in it.
One thing that Jackson did make clear. It will make things a whole lot easier for them if reporting of child abuse is made mandatory. This is what needs to happen for all the human rights violations this group is committing, not just child abuse.