Comey went on & on because he was desperately trying to find some way to get Hillary's handlers back in place. And HE was the main handler. I think the level of CIA/FBI panic has not been talked about yet. They scrambled in 2006 to find a new control lever and decided they had to take over the Democrats since no Republican could win after Bush.
Two appealing "minority" candidates came forth, Bill's wife & Obama. The deal was that the loser of the primary would get a run at the retiring of the winner, therefore it was Hillary for 2016. But no one foresaw the disaster she represented. Once it became clear chaos and panic ruled even in the pretty syable mind of Comey. But nothing was to be done.
Now they are trying to get control over the renegade Trump. It may work.