Yes. He did. Destroying a brain, even a secondary brain, means death. Even if it didn't, that means Godzilla, from the mid spine down, was basically paralyzed. Then, MechaGodzilla II kept assaulting him until he stopped moving. It wasn't until Fire Rodan gave his energy to Godzilla did he resurrect. Now please, edit the page properly. MechaGodzilla II succeeded in Killing Godzilla, for a small time at least.