Loretta Lynch getting called out and then sticking her tit in the wringer by lying is a turning point in my opinion. This sets her up against Comey and several others. While Comey most definitely isn't the brightest crayon in the box, he isn't completely stupid either.
I believe Comey knows he is screwed, hard, and if LL isn't going to back him up hen he is going to take her down. When she gos, it all goes. I'm not sure how many times she can plead the fifth or say I can't recall repeatedly but these "other people" who heard her give Comey his marching orders re: The Hillary investigation, might well be the ones who put her away even if Comey can't.