Comey is a Republican, and by all accounts a man of great integrity and honor. On top of that a non-indictment in the face of an indictment recommendation completely screws the whole process of protecting classified information. Soup to nuts - it’ll be next to impossible to convict anyone of it in the future if Hillary skates.
What else happens if the FBI recommends an indictment but Lynch refuses. Comey resigning in protest is pretty likely. Then what?
I agree with the notion that under these supposed circumstances Hillary will trade a pardon for leaving the race. Biden grabs the Super Delegates and then only needs about 35% of the regular delegates to win the nomination.
You may be right about Biden.
Another consideration is timing. Any action after February 29th will bring charges that the FBI is playing politics and assuring Democrat losses.