I remember Whitewater well and if this were the same you would be correct.
However the investigation has already been done, is almost concluded and the prosecutor would not need to re investigated. It has already been investigated.
I think he would only need to review the facts and make a decision as to whether the case is good enough to go to court.
If the case if good enough, there should be no reason by the DOJ, under Obama, should not indict. They are the chief law enforcement officials of the land and they should do their jobs, not hide behind the skirts of an IC.