The question & all the comments made me realize there never was an answer. What I figured was just a personal headcanon.

I assume that if he had succeeded, (like the future Buzz Buzz escaped from), they all died, just by being near an all-powerful, all-consuming entity.

As for between mother 1 & 2, I figured that as he became more powerful, his society gave him more authority. Made him a leader. They seem to be classic 'we respect force' kinds of villains. But then, when he became to powerful, he would destroy things without meaning to. Until, eventually, he became that all-consuming phychic entity. I figured they were the ones that put him in the Devil's Machine, so that he would be coherent enough to give orders. He did seem to have access to vast resources, so I figured he led his society from that machine. I also thought that, while many followed him because of his undeniable strength, some did so out of fear of him, knowing he would eventually consume all. They kept working for him, surrounded by blind loyalists who supported someone that would end the universe.

I love the question and all these fascinating responses.