Assuming the original organics have to absorb a comparable amount of data to what Earther brains do, any brain with stimulus of the outside world will grow, which means overseers in a vat that interact with overseers in bodies will, even if not given stimulus, come to know their bosses and their personalities and moods and what not, and have as much chance of manipulating them as anyone whose only power is a bunch of underlings. How expensive are well trained overseers to replace? That is how much leeway they have in whatever equivalent they find to human bureaucrats with small amounts of power.

Could they develop superintellegent AGI? Depends wholly on their brains architecture, and their skill with artificial selection. Not enough data to predict.

Is this society evil? It is very slightly possible that it is not. I mean, I know some autistic people who on occasion wish to be cut off from their bodies during sensory somatic issues. Ehh, cloning aspies who are afraid of touching is kind of evil if it's just as easy to clone aspies who aren't afraid of touching.