This is a pretty minor correction to bring, but we would need to find some clarification about Yamagami's mother (Shinzo's killer). Was she a member of the cult or just a supporter, and what kind of money did she give them? Her own savings, or did she organise fundraisers? Did she sell her house to the cult, or did she give the proceeds to the cult?
The reason I ask is because this is pointed out in both Yamagami's page and Shinzo's page (as the motive for the murder), but in different ways. I harmonized both pages to point out that Yamagami's mother was a member of the cult and deep in it, and she sold her house to give the proceeds to the cult. But truthfully, I have no idea. Neither did the previous authors I believe because that paragraph had no sources to it anyway.
Perhaps Alice Magatroid can help us as they seem to speak Japanese? (I have no idea if you can tag people on Wikimedia).