You make excellent points Joshua and sounds to me that you are on a good path. I agree that the parts that you are talking about contain useful observations that are well worth discussing and exploring.
However even though I am someone who people probably think aspires to be the Archbishop of the Church of DeWitt, even I would shy away from giving him as much credit as you may be implying in what you wrote above ![]()
I think the reason I embrace DeWitt's work so enthusiastically is that in part so much of what he says is just a "common sense" interpretation of Epicurus. I don't know that DeWitt himself saw himself as possessing extraordinary insight -- he certainly know that he was in the minority facing a difficult majority, but I don't think he thought that he was blessed with any peculiar insight that ought not to have been fairly obvious to any intelligent person who reads the text rather than relying on the commentaries.
So I do think that there is something much more extensive here than just that we have had access to DeWitt. There is a lot to think about here so it's great that you are working on it!