Evidence, Externality and Antecedence: Inquiries into Later Greek Causal Concepts

I want to tackle two related problems in the analysis of later Greek causal concepts. Firstly, what is the distinction, in Hellenistic theory (in particular medical theory), between aTtta tQoxaTaQXTLXa' and acTLca n3Qo?yov'1Eva, between antecedent and preceding causes? And secondly, what exactly is the connection between the three notions of the title, evidence, externality and antecedence, in relation to the concept of antecedent causation? Both these issues have provoked puzzlement; and the resolution of that puzzlement should contribute to a better understanding of the complexities of later Greek causal taxonomy.