Did anyone even mention Chester Desmond?

I don't remember all of what happened in FWWM, but didn't he touch the jade ring and immediately disappear?

I also remember that someone (him?) wrote "Let's Rock" on the windshield of a car, which Diane also famously said this season. Are we to take these points to mean that Chester Desmond was a tulpa? But if so, where is the real one?