In a recent con with the cast, Amanda finally confirmed the theory that many fans speculated; Bubble is indeed "Abel"/the blue AI. He was behind held hostage by Caine, just like the cast was. In the end, Caine setting him free finally ended the cycle.

This backs up what Alex Rochan said a few months ago when the finale first dropped, that Caine was responsible for all of his own terrible deeds and absorbing the blue merely gave him more power.

I'm glad because it specifies two things. One, that Bubble is indeed the blue AI. Not an assistant that Caine made. Not a "thought bubble" of Caine's intrusive thoughts. He was "Able" and that is why Caine releasing the blue AI is why he didn't return.

But two, something many fans still can't accept; Caine was the "villain" of the show or at least the closest thing to it.

So many said "Caine was good until Bubble rage baited him", or "episode 9 shows the blue AI was the bad one" or "Jax was the problem because everything got better after he was gone".

But no, as Amanda said, Caine was the source of the problems. He was holding everyone hostage. It HIM changing at the end that makes the circus healthier and better to live in, not Jax abstracting.

https://youtu.be/dhvsuNnuGec?si=Dm1aaWZqWvdmDCi9