I'm similarly surprised there wasn't a leak sooner. While it was well suspected there was such a group, due to coordination and the references to it mentioned in the article, the group was pretty big even if it was dominated by a relatively small number of maniacs. It's something of an achievement to have avoided leaks despite having people with mental illness and/or significant personality disorders. In fact most of those people I listed in my earlier comment would have one or both of those issues.