Dramatica-ly speaking, Probability is about what is most likely while Possibility looks at the range of likely alternatives. You can flip wave length with wave height for another perspective, but unless/until you are able to do that while also knowing what it means I would refrain from switching views in this manner while using Dramatica.
But of course that leads to the question of how to know which term is the particle view and which the wave. The definitions often hold a clue. For instance, the Dramatica dictionary says you can have many fates but only one destiny, which suggests to me a range-or wave-of fates with a single-or a point of-destiny.
Additionally, if you need help deciding which term Dramatica is using as the particle or wave, look at its placement within its quad. The four areas in a quad are a Particle view of Particles [P/P]a Particle view of Waves [P/W], a Wave view of Particles [W ( P )], and a Wave view of Waves [W(W)].
P/P , P/W
W(W), W( P )
If the term falls into the Particle view [P/], look at it as a point in the wave. If the term falls into the Wave view [W(x)] treat it as the wave.
Since Equity is always seen from a particle view on the DTSE, I would suggest to always treat it as a point on the wave. And all that means is that you are looking for a point of Equity within a range of Inequities.
Also keep in mind that this view is not so much about which one is a wave or a particle as much as seeing how the terms are different from one another, even when the definitions seem really similar.
-On an unrelated note, ever wonder why the RS is so different from the rest? See the table above. It’s looking at waves within waves, ranges within ranges, changes within changes. This is why the MC just looks like a source of conflict for me, but the relationship looks like the changing of the space between us. It’s why relationships don’t just look like sources of conflict, but like conflict that drives the relationship together or apart, or to be weaker or stronger.