he is certainly suspect since he is over the bureau of prisons. Also his people were responsible for him being in custody and that brings the responsibility to know the conditions of his confinement.
most people don’t understand the workings of a jail or prison. Easy to lie and distort or cover top mistakes.
Barr is responsible to the federal bureau of prisons and the FBI he and the doj shouldn’t investigate., I would put rudy on this. There are some national consultants who would do an objective job; people who do after action reports on riots, hostage situations, etc.