I wonder, was it the nanobots that the safeguard injected in Killy that constructed his retina and whatever else we don't know at the moment or was it that they somehow made him "see" with his retina, which was there from the beginning. Then there is the question, what kind of human is Killy and what made all the other cyborgs?
Sanakan being the baddy here is a shocker but really, there was something wrong with her since they made contact with those settlers.