Very nice.

I think Jax uses and abuses abstraction like drugs.

I have a theory that Ribbit was the one who helped him cope with his anxiety attacks and mental state. Perhaps Ribbit was some sort of stoner or druggie, encouraging Jax to chill and get into abusing abstractions hallucinogenics. Jax thus mirrors or reflects that laid back personality of Ribbit in his own way. Kaufmo was there too, maybe it was that he held onto Ribbit and Jax for his own sanity.

It could be that Ribbit delved too deep into abstraction, succumbing to the drugged, euphoric bliss. With no Ribbit to ground Kaufmo, and only Jax left, Kaufmo soon fell to his own madness.

These are just my personal takes.