Thanks to Julian we are moving on with those enigmatic walls all over the island...
Still a lot of work ahead, but hopefully the knowledge about who / when / why will clear up!
https://www.researchgate.net/publication/318277471_Incense_and_imagery_mapping_agricultural_and_water_management_systems_on_the_island_of_Socotra_Yemen
or here:
http://dro.dur.ac.uk/21552/
