This may be more about a cover up than a take down.
Q: Was the affadavit sealed? If so, how did the press get it? If it wasn’t sealed, is that unusual? How did this info get out? And WHY...?
Too difficult to determine, I just keep it simple. FBI thinks a crime may have been committed. They discover the suspect is a Democrat. FBI finds no intent, case closed! See easy and allows more time for the FBI to work on railroading Republicans.