Here's a graph of the view that (I think) Wrangler holds:
So, in this image, we see mysticism as the bottom level and rationality as the top level. For Wrangler (correct me if I'm wrong), these two labels are opposing and mutually exclusive, and Plato represents a departure from the mysticism of his predecessor Parmenides and the "Neoplatonist" Plotinus.
In the bottom right, I have a "wider" view of history suggesting that (possibly?) there's a constant up and down between these two ways of thinking.
Obviously, like any graph, this one leaves a lot of data out (where do the Sophists fit?). But I hope it's a fair and accurate description of Wrangler's view of that time in history. It'll be with this graph in mind, and in an effort to figure out whether this graph is a reflection of reality/history, that I'm heading out to read (under Wrangler's advisement) Plato's dialogue, The Ion.
Wrangler's Plato is writing against irrationality, mysticism, and poetry -- and I'm going to see if that's the Plato I find in The Ion. If it is, I'll have to reconsider the Plato I think I'm seeing in The Republic. I'll report back.