My map is dotted with Gaia settlements: three houses, a pyramid, a grain shed and two fields. No one is working the fields, but the freehold is guarded by 4-5 formidable spearmen. I can kill them and convert the properties, but I can't use the properties. Likewise random isolated small pyramids across the map; in that case, no defenders, no buildings. They can be seized but not used. What am I missing?