However, I do notice that to make the dark situation happen, it doesn't require the topleft matrix to be realized. It could even be some matrix as below at minimum,
Human, AI
Human no no
AI yes/no no(or yes doesn't even matter much)
It's all about brutal force. AI simply knows the rules and has the resources to dominate, by either eliminating human beings or coexisting with them. Essentially it indicates the fact that controlling in the sense of fulling understanding of how another works may not necessarily have any to do with surviving it. This situation is known as quanben's ditch.
However it's not fathomable though interesting as to what form the anyhow transcending intelligence (individual or combined) will take and how it evolves.
I imagine that Dark B could be something that is superb in this universe (something no naturally formed intelligence like us can attain) and therefore is supposed to last much longer than us. Whether it has enemies or not (maybe the only way the beings on that level can totally be disabled is by competing with each other resulting in stalemate or destruction), that's a game beyond our ability.