:::I do agree that causality is the most important linkage, as you put it.  But simply inserting the word "causally" here does in some sense seem to actually exclude other types of relations, which wouldn't do.  Like with the eternal objects question, I will examine this more closely in a few days and see if I can't bring in causality earlier, and come up with some phrases that emphasize causality without implying total determinacy, AND don't get too lengthy and unwieldy.  A thin line to walk, but I think it can be done...