What mechanism could be used to give Flynn his absolute guarantee that he won’t face unfair prosecution????
Other than immunity.
Assuming he's committed no crime, the best protection is a sensible prosecutor.
Something is afoot. I haven't figured out the angle yet. The press will continue to insinuate that Flynn has perpetrated a crime, that's the hole that this angle is designed to dig. But I don't see the benefit of it, unless it is simply to goad the DEMs into securing public testimony from Flynn.