That would make the oig as conflicted as the IRS commissioner in which case it would dump out to Congress to choose.
That said the oig for Treasury is a very large office for an oig and that's a very tall tree to chop down by millimeters, trump would be dead before all conflictions are litigated.
(10) If conflicts exist between the legal and factual positions of various employees in the same case which make it inappropriate for a single attorney to represent them all, the employees may be separated into as many compatible groups as is necessary to resolve the conflict problem and each group may be provided with separate representation. Circumstances may make it advisable that private representation be provided to all conflicting groups and that direct Justice Department representation be withheld so as not to prejudice particular defendants. In such situations, the procedures of § 50.16 will apply.
The oig not the commissioner would act on behalf of the IRS because the commissioner is a conflicted party.
The oig hires outside for politically involved cases. The doj has to stay at a distance and that doesn't negate the obligation to provide proof of actual damages.
Violent, criminal acts committed by individuals and/or groups to further ideological goals stemming from domestic influences, such as those of a political, religious, social, racial, or environmental nature
Did I say that? No you're conflating.