Well, the protocols would be examined to determine if the evidence was interpreted in a legitimate manner, IMO. Evidence is evidence. A reevaluation would not examine new evidence. It would just look into whether the evidence was examined properly, in essence.
Rebecca's family should have custody of her body. If investigator's conducted an autopsy, they do not have carte blanche power to then embalm or bury or cremate the body afterwards. In other words, after they conducted their autopsy, Rebecca's family had the power to have an independent autopsy conducted at that time. If after the autopsy, they decided to prepare the body for burial, they had that right but if they wanted a second opinion, they had that right as well.
Has she been buried? Where is her body at present?
I suppose they could have buried her after the autopsy, not knowing that the results of the investigation would be what they are and now are thinking about an independent autopsy. I suppose that could be the case. But after embalming, etc., that's much harder to do.
I don't think an evaluation of the investigation would delay custody of the body being turned over to the family. A brand new investigation would, though, I believe.
PR firms sometimes make statements. They also often direct their clients in how to act and what to say. Many people have PR firms handling them but the existence of the firm is completely hidden. There is not one doubt in my mind that JS has advisers helping him through this.