New Hillary emails are just copies of what the State Dept has already released in FOIA dumps.
These are NOT a leak.
And, that email is clearly just a joke.
Why do you think Mueller's investigation is out of control?
Because the press leaks tell you it is?
The latest story simply tells us that Mueller thinks there was a conspiracy between some of these people starting in the Nov 2015 timeframe.
Hiint: He already has the incriminating emails from some of these people, and he's going to get the others to perjure themselves. It's prisoners dilemma.