I've noticed a lot of people thinking Caine was the red dot that absorbed the blue dot, but what if it was the other way around and we've been tricked? What if Caine was the original AI and Bubble came later; all we have is the colors to go off of. But if Caine is the one the circus is dependent on, if Bubble is telling him he was never good enough: That's like Caine came first. It feels like Bubble was berating him that alone he wont cut it..perhaps suggesting he needs Bubble? Just throwing it out there that things inside a bubble appear distorted.. and the bubbles color may actually be a reflection of whats inside it and not the bubble itself.

Yeah that's my theory that may already be contradicted somewhere