Apparently it never occured to Hillary to buy off the FBI team on the Weiner investigation. So they remain un-tainted and their evidence didn’t get destroyed.
I think that Comey and McCabe where the “dirty” ones, and they combined to keep a cork in the FBI bottle, at the top.
But they could not contain the pressure from below.
Special Agent Leaker forced Comey to choose sides, and he jumped back toward the honorable FBI mutineers banging on the doors of his suite, instead of jumping off the top-floor FBI Building balcony to join Hillary on the casualty list.