I have to disagree in one observation. There were times where he did crumble. I an very astute at reading people due to watching my back during my time in this cult.
The cues are there, he may have had a silver tongue but his actions/body language gave him away. There was a certain amount of paranoia coming from him too. Due to him being revered as some sort of prophet, he will be used to people giving him full attention, hanging on every word he says. I noted twice Jackson Asking Stewart if Stewart could hear him, Stewart knew what he was doing, by not giving Jackson his full attention would have made Jackson very nervous indeed. The way Jackson asked was actually in quiet a panicky way!