When you have the FBI running around warning "no photos" and "no cell phones", those are specific instructions. That means that they had orders to prevent any evidence of the chat from coming forward and those orders would have come from Lynch.
My guess is Lynch was flattered to be invited to meet with her old boss and foolishly took the meeting. Clinton knows she is not terribly bright so he played on her vanity and used her to remind Team Obama of their exposure.
In all likelihood, General Lynch had an important agenda that needed to be communicated immediately to Team Hillary.
Bill does not want Hillary to win because he doesn’t want to live in the White House again. For sure he does not want to live with The Flying Reptile, but he especially doesn’t want to be on display in that fishbowl where folks pretty much can see what you’re up to 24/7.