One thing Comey has going for him, if the DOJ has to acknowledge publicly he was a dirty cop everything he touched has to be re-litigated. It would tie up the DOJ and FBI for a long, long time. Bagpipes wont do it.
It would seem to me that would not be the case if the DOJ acknowledged Comeys bias toward Trump. There would be no effect on actual criminal cases, since investigating mobsters and such would not involve politics, unless the mafioso was a vocal Trump supporter I guess.
Sad as it is to admit, you amy be correct.
There are about 1500 FISA warrants a year, and hundreds of cases where Comey injected his crooked views and I don't think Barr wants to re-open all of those cases.
There must be a marcy park solution that some one {brennen, the klintoons, weissman, holder, lynch} is contemplating.