That's major lore breaking. I wouldn't expect even more than fifteen Arbites on an established fringe world. Even an Agri-World has less than twenty at most. I'd take an assistant...maybe...and some hounds but most of my workers would be hired contractors and PDF/militia I oversee personally.
I wonder who will support the poor old magos of the mechanicus? Oh man imagine if we spotted one of those fallen and then the Dark angels show up to "Rescue" the colony from a unknown threat.
I thought they only did Neutering to the species that join the greater good they figure out how to use mind control now?
Well, not direct mindcontrol. But Etherals have cerain powers of great infuelce, thats also one of the reason firewarriors go raving mad at the death of an ethereal.