Dear David,
you're right - we have covered this subject already. Basically ...
I have a question: Did you ever explore the connection between harmonic structure and clave direction? Is there any connection at all?
The concept and terminology was developed for the specific purpose of identifying which measure (side of clave) the harmonic progression begins. That’s how the concept continues to be used today by composers and arrangers.
The start of a harmonic progression coincides with the metrics of a piece or a formal unit thereof, if we interpreted a possibly syncopated or anticipated chord properly. There is no other way I could understand your axiom. After all, the terminology is not reserved for composers and arrangers, even if Mario Bauza invented it. If I were in your place, I would interpret Bobby Sanabria's information about this accordingly.
In the absence of a chord progression, wouldn’t clave always define the metric structure, wouldn’t clave always define "one"? Why do we say that clave is the rhythmic key, if it doesn’t at least serve this most basic of functions?
This is the question that is the most complicated to answer. As a matter of fact, the answer to this question would actually explain why in folkloric music metrical orientation (and with it the clave direction terms) is to be taken with reservation. There definitely are Afro-Cuban songs (like the ones I referred to in the Arará repertory), that suggest the idea that at one time in African music the clave must have had priority over metrics. These are the instances where I hear either the "1" or the clave in a strange place and have to re-organize the whole phrasing in order to be able to work with it.
And these are exactly the instances where I have to explain to my students that they have to modify their Euro-centric view of 3/2-2/3 clave. - And the point where I share your notion that there is no 3/2 or 2/3 in folkloric music; the difference being that I still work with those terms for the sake of simplicity, because in most (Afro-Cuban) folkloric music they still apply.
Is the metrical "1" you hear most often an accent on the beat?
I don't really think so.
I don’t see how saying "that part enters on the two-side" is any less helpful than saying "that part is in 2-3".
The latter is easier to say, it is more familiar with more fellow musicians, and it refers more to the overall rhythmic feeling of the entire part, which is what I mean to express.
That was my attempt at some self-deprecating humor, as I realize that I can be pretty dogmatic at times.
Of course there isn't anything obnoxious about your way to put things. I get along fine with your way to be dogmatic, because to me it proves a kind of dedication and involvement that I am sorely missing in most of my contemporaries. I am rather grateful to communicate with you - and learn from you.
Thomas