The GAF Coup sounds a bit farfetched to be honest, all the more since Lore himself mentioned it IIRC and likes to mesh that into his narrative of mods sabotaging his work for a couple of years. Most of the GAF mods joined obscurity or only make occasional cameos on RE, they didn't really gained anything, not even e-penis. The board itself didn't roll out of the door right away : the shepherding was effective but RE could have list some feathers there. Last but not least, the event that triggered GAF downfall was fairly random, unpredictable and the power vacuum at the top was squarely on Lore's own shoulders (it's not clear if he could have salvaged things by being more responsive and not blaming a desert sex cult, I think a lot of the community was at the overdue boiling point, but who knows ?). GAF mods didn't pull the rug right from the beginning and started defecting when it was obvious Lore was out of his depth and no sane STATEMENT was forthcoming.
It was not the first time someone tried to create a GAF offshoot, I just think it was all an happy accident for Cerium and co to capitalize on. Maybe they were toying with the idea, maybe they just happened to think faster than most. They made the right moves, projecting they were serious and immediately seizing the mental battlefield to present themselves as the legitimate successor.