Comment by nomel

It appears all the "disk" labels are categorical. The concept I'm trying to find the name for is the continuous, slow, asymptotic reduction in the number of disjoint particles/collections spinning around a star. All the relevant "disk" labels would probably be all those on the right side of this curve, where water is present.

I would think the Sun, with its photons and charged particles, and the various electrostatics (like triboelectric) involved, would be the energy source. The disk starts, somewhat evenly distributed, with a whole annulus of surfaces in the Goldilockz zone, with water, etc present. Through time, these bounce off one another, eject bits, stick on others, preserve bits in ice, etc, smearing/spreading whatever allowed their synthesis.

Looks like this maybe has merit, with organic molecules found [1].

(I'm far outside by expertise here.)

[1] https://www.eurekalert.org/news-releases/1091674