Cao Pi gestures vaguely toward the logbook, whether it's sitting where it belongs or is in Riku's hands at the moment. "There is much we do not yet know about the spirits, and whether they actually fear or welcome the World Eaters. You have a point, though - if they want to, how can they help? How do we learn from them what they can do? Are they capable of ideas? The only way to know is to figure out how to communicate, and then do so."