Yes Jake an outsider should make reviews. However the outsider should: A) have complete experience and knowledge of the mission, operations and legal responsibilities of what they are about to review; A) have absolutely no personal previous dealings with the person appointing them (Trump,) c) have no political connections to either party of more than a cursory nature, d) have no on going business ties to any part of the agency or contractors to that agency. .  Feinberg meets none of these.  You are not an outsider if you are an appointee of the President.