Read the redactions carefully.
https://www.nationalreview.com/2018/02/schiff-memo-russia-investigation-harms-democrats-more-than-helps-them/
Remember this gem? Read the redactions carefully. Sources and methods. Keep in mind that Schiff knew what would be redacted when writing his memo.
Notice the difference between how Mueller filed his and how Schiff wrote his. Also, remember that Flynn plead guilty. Mueller merely brought the case to court.
Consider the possibility that all Mueller has ever done in his capacities has simply been to carry out the responsibilities and duties of his position. Consider how this would be working very differently were it not for a POTUS willing to see that evidence is declassified.
Also consider that there are other things which can be redacted because of how it relates to ongoing investigations or court cases. The very fact this 302 existed and was filed under seal is fairly big. The fact that DC was rattled by the clearing of the court room also reveals that this type of investigation hasn't happened in a very long time. They cleared the floor because of classified material/accounts, as well as ongoing investigations.
Leaks usually benefit the deep state.