I don't think anyone has brought it up quite yet, but what about the belief of ecclesiastical authorities like Eusebius that Adamantius of Alexandria was the same as an Alexandrian middle Platonist of some repute by the name Origen?
Now I'm no philosopher, but I have read up on the matter (Dillon, etc), and from what I can gather, a real middle Platonist (or followers of Aristotle, or even Zeno the Stoic), would have ripped the Christian "Origen" to shreds and spit him out well masticated. Origen, who along with Clement of Alexandria, dabbled with middle Platonism as revised by Philo of Alexandria, but I do not see a lot of evidence that Origen was a really "deep" thinker of the caliber of "real" Platonists active in the city.
Origen took Philo's twist on middle Platonism and twisted some more to make a "Christian" understanding of Philo's principal(s). Otherwise, he seems more like a "sophist" in its original sense: A tutor in basic education for the better off Alexandrians.
But tha's jus' me.