@Whousedtoplay all good. It looks like that's Dan's take on things from whatever era it was written. We think about a number of these things differently, but on the bandstand it has never even come up, whether it's was me playing his charts or his playing mine. When in doubt about the particular chord symbol, we usually just talk it out to get the other person's intention into our own vernacular.
My own take on poly chords tends to be limited to triads over a bass note, as below:
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Other than that, I don't see too many discrepancies. I just prefer to think in terms of "possibilities" rather than "answers". But then I wasn't writing a book, either, and my aim for the intended student audience has always been something along the lines of "there are 3-4 empirically correct notes in any slash chord, and then there are notes in between. Those notes in between will determined by context and the subjective interpretation of each person who sings/plays them. Find your own "in the cracks" notes and use them until you hear something different, then play that."
The following is from a tune I wrote several years ago in honor of David Baker. We played it on two of the Aebersold faculty concerts that year. I do remember that we had to have a discussion in the band about to interpret some of the slash chords both on the head, and during the solos.
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We notate things as we think best in the way that makes the most sense to our brains. When in doubt about someone else's charts, I always first look for a pre-existing recording and listen to that, then ask the composer (if possible), then just go with what my ears tell me is the best way to interpret the written symbols.