Regarding when the Group Study Arrangement stopped -
I noticed that it coincided with instructions to not use 1st names, even within the Group Study. They were stamping on natural human relations. To not use someone's name is cold and distancing. The apostles did not refer to each other as 'Brother + surname'. The term brothers is used as a collective term in the Bible and maybe as an affectionate term but not as a general replacement for a name.
Also around this time, they stopped speakers bringing the love from the congregation they came from or had visited. The love was only to come from top down. It wasn't to go sideways.
All this reminded me of Gestalt Humanistic Psychology - teaching people to live without love, within a cold set of relationships based on contract and money (ie the corporate environment).
Given it is pretty clear they are nothing but a media and property developing company posing as both a charity and religion, the practice of Gestalt Humanistic Psychology instead of Jesus' teachings seems to be their direction of travel.