User blog comment:Mohrpheus/Spiritual Imbalance in Bleach - The End of the World?!/@comment-1393830-20100830223547/@comment-1268838-20100830225305

Exactly. Somehow I doubt that the Shinigami are THAT efficient at purifying Hollows, especially since they only go after the ones that show up in the Human World. It's too late for the Menos - they almost never leave Hueco Mundo.