I understand that. However, if the police were focused on him and his DNA, if he kept saying over and over he was innocent they would only have moved to his son - so there is no way he was trying to protect his son or he would have just said he did it. ANY move away from him could have turned toward his son.
Not necessarily. The police were so focused on OJ, to the point of planting evidence that they weren’t about to look ‘elsewhere’. Even after losing they were so intent on it being him they considered the case closed.