Well in theory you ought to be able to do that so long as the new AG doesn’t interfere with the investigation. The problem isn’t really that Barr is not the same AG as the one that was running things before, the problem is Barr delayed the release of the report for (arguabbably) political reasons, attempting to spin this report for all it is worth and maybe (or maybe not) redacting the most damming parts of the report. Oh, also failing to release the actual summary while substituting his own that clearly did not actually summarize things.
Those are all problems. Barr replacing the prior AG because he would presumably do all that (and maybe more) is a problem. However I wouldn’t argue that “merely” replacing an AG during an investigation is in and of itself problematic.
