There is nothing in this entire galaxy* that gives distinguishes robots from fleshies beneath their skin. We should start with the fact that you can hack into some loser Imperial's (is there any other kind?) brain with the same ease that comes from forcefully opening the mental vault of an overgrown Virtual device. Look at those overgrown Concrete devices too, they can reproduce with the simple aid of "Food". Food is good question, because the right high tech can produce biofuels out of Food that make your fusion reactor look like a flashlight that you have to make repititive hand motions to recharge every half hour. Whatever Food is, it's clearly stronger than our food. Food can somehow triple the population of a planet in a time that sounds way faster than the 18 years a human needs to enter the workforce. Years are apparently meaningless, I haven't heard of anyone here ever dying of old age. What are Sisters? Do Sisters parthogenate? Do Sisters draw new female humans out with promises of food before giving them three months of medical training and a burlesque costume? Do Sisters sell the male babies to Emperor Zelevas' secret workshop? Cut those ideas with Occam's Razer, Sisters are clearly gynoids.

*Immigrants may not apply.

Consider food the "habitability" of a planet and consider "new population" the immigration of populace from one place to another rather than the birth of production of a population or consider it enough people "coming of age" to be considered employable. Also consider that population is not representative of one individual but rather a "unit of populace" which is a relative term to be understood as a group of people. 

For a better understanding of the Sisters of Mercy read up on matriarchal societies. 

Couldn't the hacking creators also make a program that takes a hacking algorithm and filters it through a biomatter analyzer which then converts the instructions to the corresponding set of synapses firing; basically getting the same result in the form of "rewiring" the host to do what is needed - something akin to how muchrooms hack ants?