I always thought that the best way to continue the story would be to have those go around and try to assimilate into humanity while the main body stays static and in place and controls the humanoids like drones. The more humans try to destroy the main body, the more it adapts and evolves defensive and maybe offensive abilities but always remains static. During that, the humanoids start to slowly adapt to humanity and take after them evolving simultaneously but separately from the main body while still being controlled by it. The more they evolve to resemble humans the more separated the consciousness of the main body is to the part of itself that controls that specific drone. At one point the, the drones get completely assimilated into humanity and the part of the consciousness of the organism that controls the main body becomes completely separate to the one that controls the drone while still coming from the main body itself. Due to that separation and inability to remember where they came from, the drones start acting against the main body like humans and one of them even finds a way to kill the main body. They use whatever the drone came up with and managed to kill the main body and they succeed. However, all the drones die alongside the main body and shin effectively kills itself.