"Attorney General Loretta E. Lynch plans to announce on Friday that she will accept whatever recommendation career prosecutors and the F.B.I. director make about whether to bring charges related to Hillary Clintons personal email server, a Justice Department official said." (Emphasis supplied).
My scenario is, of course, conditioned on the assumption that there will be a "recommendation" for proceeding against Hillary.
I quite agree with you that if the report does not recommend prosecution, Hillary will cite it just as she has cited the Benghazi report claiming it as an exoneration.
My point is that there is no such thing as an FBI report that recommends prosecution. Even a report that has slam dunk evidence in triplicate that a crime has been committed does not include a recommendation to prosecute.
One more thought, this one on the prosecutor's decision. A procesutor could decide to forego proceeding on all manner of rationale, not just including probablity of success. See, e.g., the plea bargain with Petraeus.
Yaelle pointed out that the fact that Hillary is a viable candidate for the office of president is a factor in the decision. Ponder that. Political popularity yields immunity.