What part of “in a manner” do you not understand about Philo’s text and explanation? The mechanics of his interaction with the other kings is simply not relevant here and Philo says as much. All that is needed is to understand the way a leader relates to his herd. That’s it. Read it again and more carefully and you’ll see it.The difficulty is that "leader of the herd" is not a particularly literal translation of this phrase. I would prefer to see Derek engage with the passage in Greek, rather than continue to comment on the English. This is from Fitzmeyer, page 86,
- Philo speaks of Ptolemy II Philadelphus as one who was outstanding among the Ptolemies and expresses it thus,
- genoumenos kathaper en zōō to hēgemoneuon kephalē tropon tina tōn basileōn
being, as the head is the leading part in a living body, in some sense the head of kings [of the Ptolemaic dynasty]. (De Vita Mosis 2.5.30)
πρῶτον μέν νυν τύπον ποιησάμενος λίθινον ἔστησε: ζῷον δέ οἱ ἐνῆν ἀνὴρ ἱππεύς, ἐπέγραψε δὲ γράμματα λέγοντα τάδε: “Δαρεῖος ὁ Ὑστάσπεος σύν τε τοῦ ἵππου τῇ ἀρετῇ” τὸ οὔνομα λέγων “καὶ Οἰβάρεος τοῦ ἱπποκόμου ἐκτήσατο τὴν Περσέων βασιληίην.”The truth is that Philo's use of kephale is as a metaphor, and we are not exactly sure how to translate it. It is not an established way to say that someone had authority. Philo uses the word kephale elsewhere to denote a person of exemplary virtue. There is no indication that Paul wants us to believe that the husband in a marriage relationship naturally displays an exemplary morality that the wife would do well to emulate. The comparison is strained.
First he made and set up a carved stone, upon which was cut the figure of a horseman, with this inscription: “Darius son of Hystaspes, aided by the excellence of his horse” (here followed the horse's name) “and of Oebares his groom, got possession of the kingdom of Persia. Herodotus Histories
Here is a longer article about kephale in Philo. I regret that these are not full posts, but simply responses to a discussion which is ongoing on Denny Burk's blog, where I have been blocked.
The main question that I am left asking is why such a passage would be considered one of the most significant pieces of evidence that kephale means "authority."