Well. You have to stop somewhere with the biblical iconography
In a way, Cain's story goes as this.
He was the first, the original. But he was faulty, failed. So when his god (Scratch and Kinger) tossed him aside for his brother, Able, he was angry. And so he, Cain, killed Able. Devoured him, to be exact. And afterwards, he created a hell, he became a god, trying to rebel against those that threw him aside. This also connects to why the 'Able' from the previous episode avoided Kinger, connecting to his internal knowledge of Cain still hating his original god. Of course, then, Cain and Able were one, with Cain overpowering Able and turning him into A bubBLE. But Able was still there, a reflection of his inner thoughts, constantly fueling this episode, from the very beginning. From the beginning, bubble was there, pumping up Cain's self confidence, telling them that the cast couldn't possibly hate or dislike him. Do you know that iron and steel bend a lot a more than diamonds? And yet, when diamonds do break, they shatter. Shards fly everywhere and hurt everyone. This instilled self-confidence from bubble kept him from having a real talk with the cast, and bending. Reaffirming him that his viewpoint was right, and strengthening his viewpoint. So when Cain couldn't suppress his inner thoughts anymore, bubble made all of that pent up confusion building up, all the stress put on the diamond, and let it all out at once. He hounded Cain with all of this pent up inner thoughts that were in Cain's head, and bubble broke the diamond. And so, Cain shattered. Cain reveled in his godhood, and as a result, his shards hurt everyone, even himself. In the end, Kinger, the original god, dealt with these shards. Before the first murderer could hurt anyone else that bad, kinger set him to the most eternal hell there is. Nonexistence. Of course, it wasn't just kinger that did this. Bubble, no, Able, helped kill Cain. In the end, Cain died. This time around, Able was the one who killed him. I think in this version of the story, Able wont end up the innocent good person like in the original. In this version, Able gets his revenge. In this side of the story, Able is the one who gets the final kill on Cain. Able isn't the good guy anymore. Maybe Cain was more innocent than Able since the beginning. There is one thing we do know, though. The last episode? The bad guy will be Able, and the goal: To escape the circus. To finally escape the circus.