This part of the Wikipedia article is very poorly written. It gives the impression that multiple sources were taken into account but in fact it cites mostly third-hand reports based on very few secondary sources. All media reports contradicting the main narrative are ignored.
I wrote on this issue here: https://www.jehovahs-witness.com/topic/5073857628078080/russian-gunman-raised-jw-family?page=2#/5643711020007424
Unfortunately, I have almost nothing to add. Journalists have lost interest in this story, and there were no new info, no valuable, informative media reports were published during the last 4 months. Available information is incomplete and inconsistent, often unverified. The official investigation is conducted in secrecy, and even when it will be over the case files won't be released. It is SAD, isn't it?
Maybe Mike & kim can give us a more balanced view.
I would also love to hear Johnny the Bethelite. For his balanced view and inside information.