Great thought experiment.
And even at this stage, I think it's completely valid.
If an entity has power over other humans in intelligence and dexterity, destruction or creation - then yes, they should be held accountable and also respected as beings, equal beings (if equal with ability). The same concept should be applied to cloning a Neanderthal or creating a bioengineered being with equal mental, emotional and physical ability as a human. We might make slaves, but if they really were slaves,they shouldn't be designed to suffer as slaves - which also is a right. A right to not have the ability to suffer. It's ethical to even think that way - not only for the entities that may be created, but for ourselves - our conscious. What we treat as human. I think it's a great exercise, and to be honest.. it's a gift to empathy and humanity to think of other creatures in likeness and to treat them as so - even in thought... the practical implication of the thought may help us see other humans and people with more empathy and just actions.