especially when we consider that Epicurean literature was just re-discovered
Nate that takes us to the issue of Cicero's works and also Diogenes Laertius. I think '"on ends" in the torquatus narrative especially gives a pretty full view of Epicurean philosophy, and I am also thinking that diogenes Laertius was never fully lost, and that a lot of the church fathers continued to study and speak Greek (Elli will say that's obvious, and I am sure it is).
So if we are trying to be rigorous i think we would want to verify the situation with DIogenes Laertius, and I am not understanding that there is an allegation that that was ever "lost" like Lucretius allegedly was.
Does anyone have data on the history of Cicero's works and Laertius?
And that doesn't include Lucian, who we probably ought also to correlate.
My view (admittedly without hard evidence) is that what we're taking as "lost" and "rediscovered" needs to be examined closely too, because I would think that even historians acting in good faith (which not all of them I would grant that to) would not have a good way of canvasing all the available sources to determine who knew what and when. I would see that as almost as much guesswork as anything we're discussing ourselves in putting names to faces in the fresco.