Based on a leak last year about the meeting in the FBI there were several present and the decision was made to proceed with the investigation based on the evidence of guilt. Note that there was no indication of when the meeting occurred.
The FBI became aware of Hillary’s server about three years ago when they helped Romania catch Guccifer. Five of Hillary’s aides lawyered up around November of last year. My guess is the war of words between the White House and its proxies and the FBI finally convinced Hillary that the investigation was not going to go away. Hillary of course retained David Kendall. It might be interesting to figure out when that happened. I think that was pre-Petraeus who also used Kendall.
The roots of the investigation go back farther than is public knowledge. I wouldn’t be surprised if Comey made his decision in the first half of 2015 or earlier based on the known key events.
Since the entirety of Watergate, from break-in to resignation, took just under 26 months, I cannot help but think we are being played here.
I have NO faith that Comey, the FBI, the DoJ, Congress or any other part of our present system of government will see to it that justice will be served and the guilty punished appropriately.