Rasputin isn't talking about other war minds. He saw the darkness in the garden and realized it is stronger than even the "gardener" and asked himself why. The Darkness was alone and Powerful. Rasputin saw this and did the same by design. He Killed of his makers ( i don't think he was made by other warminds) to also be alone and Powerful ("They made me to be stronger than them"). Being alone is what Rasputin saw as the reason the darkness is so powerful ("IT is alone and IT is strong and IT won") Rasputin learned from the darkness and survived because of it. His Choice.