There is a really simple way to counter the “Shifty” & “Needling” posturing about Barr engaging in a “cover-up” if he redacts anything out of the Mueller Report.
For each and every sentence(s) redacted, Barr should simply footnote it with the relevant comment: e.g. “the material redacted here is direct / specifically quoted Grand Jury Material (date & location citation) incorporated into this Report.”
Then let the “Shifty” & “Needling” dynamic duo put up or shut up: i.e., go to court and demand that the judge un-redact that direct / specifically quoted Grand Jury Material.
That’ll learn ‘em.