He has no outs... if he has a Trump memo, he has memos of every conversation with leading Democrats and their scandals (fast and furious, servers, Benghazi, etc...). Next, if there was interference by Trump, it is a serious felony not to report it to his superiors at the time (no excuses).
Any memos (FBI work product) he did not turn over after being fired is a felony. If he kept memos and is in possession of those memos, it is jail time no matter what is his excuse.
He has all these "outs" with the public hearing in Congress... the Dems on these things just sit there and lecture for the cameras about evil Trump, and the Repubs on these things never dare ask any hard questions. Comey sails through these things with ease and the MSM winds up with more ammo to use against Trump.