Not all Greeks, I would say. I feel many followed the Archons, as well as Romans and the like. But certainly some of them, the philosophers, seem to have been of the same ilk.
It raised a question on the role of Christ. Did those before him receive the grace of the father? Is he one of many to have shown the way?
I think it was possible to know the logos without the Christ, but when the Christ was apparent, it became the most perfect representation of the gnosis necessary to see the Father. So Plato saw it, but not the best way. In such aspects, I think such individuals stay at the edge of Fullness until ready to go to the Pleroma. As opposed to most every one else, who rests in Hades. Not good, not bad. Just kind of dead.