Flynn’s plea will be voided in my opinion. The interviewers didn’t believe he lied to them and if the rumors is true that McCabe ordered 302s to be altered then all there is left is that Mueller team put great pressure on Flynn to confess to lying based off of altered documentation and threats to imprison his son on top of the financial cost to him. The IG report will come out and point this out apparently and then the charges against McCabe will be brought around the same time.
From a different angle, reminders of how awful Mueller and Comey are comes from their long-ago bungling of the investigation of the (1996) Khobar Towers bombing and related Middle Eastern terrorism:
https://threadreaderapp.com/thread/964965772320677888.html
They are the worst of the Deep State !!