I believe that if someone is participating in a discussion under a handle, and someone else suddenly and unexpectedly drops their real name into the conversation, most people would view that as an implied threat: “Keep this up, and I’m going to publicly unmask your real identity”. That is how I interpreted your action, and your subsequent suggestion that you might do exactly that, along with revealing my employer, only reinforces that impression.
You may not consider that unethical, but I do, especially when the name was obtained for a specific legal purpose, such as (I presume) looking to see if Paul and Fred were telling me what to say, thereby making me a “surrogate”. As you’ve no doubt discovered, they were not. And dragging me into the case with a subpoena would be pointless, as I’ve never met nor spoken to them, so you already possess every word I’ve ever exchanged with them. There’s nothing I could testify to that you don’t already know.