Aristotle: The Primary Substance

Here we have to look at the four categories of onta (beings, or what is) per Ari.  Is it said of a subject yes/no, is it in a subject yes/no.  Particular subjects (not said of a subject, not in a subject) are the highest form of being. From Susan Suave Meyer, Ancient Philo Pt 2 on Coursera:  “Plato thought that the entities
that deserve the title ousia, the most fundamental entities, are suprasensible, intelligible forms. Aristotle, by contrast, thought that the most basic realities are those that serve as subjects for
all the rest. And these are such ordinary entities as human beings, and other animals.”