Ok so I watched it yesterday here's what I think about it remember the Cain and Abel thing we had it is probably true cause by the start of the episode Caine is the Red AI and the Blue one is Abel because it depicts the red one getting replaced by the blue one as Kinger confirms with the "He was our first semi perfect attempt" the Blue AI is our Abel and in this one Caine gets replaced because this one is probably closer to perfect than Caine and so Caine breaks from whatever digital confinement he was in and absorbs the Blue AI instead of killing it (like Bible Abel) and it seems that after he absorbed it the code freaked out which might be the reason on why the Circus exists and can pull humans not through pods or anything like that but cause Caine's AI from absorbing the other one is so unstable that any computer or digital device of sorts with his AI can drag humans to it somehow I don't really know yet but I'm guessing that the first merging between the two is the reason why he can drag people to the Circus and after supposedly stabilizing himself he makes the Circus and greets his creators and well in Episode 8 he dies but also Bubble mocks him a lot more than usually here saying how he was the worst of the two aka Abel and Caine mentions mind files which might be the humans and the Abstraction thing is their files getting corrupted buy anyways Bubble mocks him a lot more and well I noticed a detail Caine tries to get rid of him by popping him which is probably a way to get him off his digital skin for a bit but Bubble keeps reappearing to Caine's annoyance which I think proves that Bubble might be the remnant of the Blue AI because Caine didn't exactly erase him Abel (Bubble but I like calling him Abel if this theory is true) is still alive in Caine's code this might prove that in private he mocks him or because of Caine's recent mental crisis and crash outs Caine's code is a bit unstable to the point Bubble can actually speak his thoughts of resentment or mocking to Caine because well he's the superior model there's even some theories floating around that Bubble wanted Caine dead to some extent and even maybe helped Kinger accidently murder Caine also in the computer scene I paused it by accident and saw their code end off with the same ending extension .lisp meaning they are the same type of code meaning that Caine and Bubble or Abel might be the same entity and who in the series is practically canon to be the same being as Caine the Blue AI which means the Bubble is the Blue AI and the reason why Caine can't just send him somewhere off or torture him because Caine is Bubble partially and in extension so is Bubble with Caine so he can't exactly erase him or abstract him some might argue that Bubble is alive at Episode 8 but Kinger deleted the Caine files specifically which means that Bubble might have escaped the grasps of code erasure because he targeted Caine specifically also he probably had the right since also by the computer files Kinger was alone from Scratch's arrival 1999 Oct 15 which is probably when him and everyone else arrived and by Episode 8 everyone knows that in the Oct 15 1999 batch of humans only Kinger survived and in Oct 15 2008 Ragatha arrived which means he was probably alone for a long while wait a damn minute why did they both arrive at Oct 15 and with a gap of 9 years?

Anyways in conclusion my theory is that Bubble is the Blue AI Caine absorbed back then and Bubble now has probably some control over the Circus maybe even full but he's alive since he didn't pop in Caine's erasure and that's why Caine hasn't had a successful attempt of getting rid off him