No one has alleged a crime.
The issue is that he allowed someone to speak to the press, and lacked candor in discussions with investigators about that. (Not a crime, though lacking can
McCabe alleges he had the authority to make decisions about speaking to the press and did so regularly.
We obviously don’t know anything about if he lacked candor or not. No reason to believe the IG is lying, though the speed of his firing does appear out of the ordinary from what I have read, and similar reports have been filed after FBI personnel were retired.
Again, had the president not been spouting off against McCabe on twitter for months, we wouldn’t be taking about this.
Given the facts as we know them, the timing of his firing appears to be political revenge best case and worst case, an attempt to discredit McCabe as a cooboratung witness.