For now, it's just a writer at PJ Media, but this is of course the real story that people do not understand. Most people have never dealt with classified information systems, and don't realize that the air gap exists. If they understood about the air gap, they would realize that there is no chance that these various Hillary defenses could possibly hold water.
I've been reflecting on it more since we last talked about it, and I think maybe the most likely case is that the Hillary State Department -- or at least her clique of advisers and aides, as well as non-DOS personnel from her faction like Sidney Blumenthal -- were just completely careless about classification. It's less likely that they downloaded or wrote down information from the TS system to transfer onto the private email server than that they summarized what they'd read on the TS systems in unclassified emails. Quite possibly she and they believed this was perfectly safe to do, as they controlled the server and were only talking to other members of the trusted in-group. The danger of hackers? We have a top-flight (at least very well-connected) IT firm to prevent that from being an issue. Classification rules? I slept through that briefing -- who cares about rules, rules, rules? We're the powerful.
In that case you wouldn't need a firewalled tie-in, nor a band of flunkies whose job it was to strip classification markings. There were none to strip, since the information was transferred across the air gap in your brain. This seems like the simplest explanation, provided that we discover no examples of actual classified documents in the email. We should expect, if this is right, only to see summaries of classified information in these private, unclassified emails.
From the perspective of the law, this makes no difference. The rule is that a document that contains classified information is classified, and if it was built out of another document or set of documents, the new document inherits the highest level of classification of any of the summarized documents. Thus, if I write an email to you about yoga and your daughter's wedding, and at the very end say: "PS: Did you see the column of tanks moving up on Benghazi this morning?" based on a satellite photo from the high side, the email I have just written now needs to be marked "TS // SI / TK // NOFORN" and cannot be sent on the unclassified system. Indeed, just because the computer will automatically save a draft of that information on the unclassified system while I am typing it up, just by typing it up and not sending it I have already committed the crime that Petraeus went down for (i.e., storing classified information in an unapproved location).
She's in real trouble, and sooner or later the reasons why will seep out into the public debate. Wiping the server will look more and more like destruction of evidence and obstruction of justice, as there's already enough to convict her of several felony counts in what they've found.