Nah you got it. That is what I'm saying, we are mistakenly reifying our probability assessments onto the event sequences happening in the Actual.
And so when someone asks "What is neither deterministic nor random?" it's asking "What is an event that I can never assign any probability to?"...which is an impossible question, b/c you can always assign some probability even if it's - as in the case of an Excession - nothing more than an attempt to translate your qualia of confidence into mathematical terms.
Perhaps more importantly, assignment of probability says nothing about the actual causal powers at play where we have to explain both what happened but also why something else didn't happen...a very tall order...
Hmm, well, I have a great deal of "trouble" with the idea that anything is actually random, that is, completely absent any causal relation at all. That seems, in my mind, to denote the problem of "something from nothing."
If I am following your line of thinking though, is this the same sort of question as to asking about Mathmatical Realism. If I remember correctly, isn't there a way to think about the fact that math is never wrong, because math is the thing with which we are conceptualizing the phenomena. So, sort of like, if all we had as sense organs were eyes, eyes could never be wrong, because eyes are all we would have to verify what eyes would see.
I'm not sure that I buy that, but I think one could make the case. So, determinate and probabilistic might be the same sort of things. Categories that we place on things as tool to make "sense" of them, but not fundamental properties of things themselves.
If that makes sense in this context. This topic quickly seems to slip from my conceptual grasp every time I try to hold it, do I'm never sure where I am, where I am going or where I came from...