Isn't it kinda fitting that after so many people threatened Gege with death, that he ends up having to cut the manga short because of his failing health?
1. I can't remember
2. He had to kill all of the players/swimmers in the culling game to activate the ritual on Tengen
3. From the looks of it, like he said he was out for revenge, but he could have chosen to turn back. In the end he did.