Jack, as a member of Bob Mueller’s team, who needs to get back to investigations of money laundering, I’m comfortable with your explanation and can assure you the likelihood of your case going to a Grand Jury are slim and none.
That said, and notwithstanding photo ops that may have convinced you otherwise, Rocket Man is still operating autonomously, and I can’t be sure there won’t be future missives perpetrated by him.
Good luck!