I would submit that this is a grey area at this level and one that has been consistently ignored by Democratic administrations. And if they want to play with knives in the gutter - that is where we need to play also.
The worst-case scenario would be for someone who is prosecuted by Sessions to file a complaint against Sessions for ethical misconduct over a conflict of interest. Even if the charge doesn't stick, it could be sufficient for a criminal charge against that defendant to be dismissed, or a conviction overturned. Is that really a risk you would ever want to take ... just so the AG can be a "fighter" in your mind? Please.