Although I think CM will be found guilty, in the event there is a mistrial, hung jury, or acquittal, the biggest factors that could lead to that IMO are:
1. The lackadaisical and lazy investigation of the disappearance of the family by Dugal and SDSO. That it wasn't treated as a crime from the outset is a crime itself. That Dugal couldn't be bothered to push for search warrants when we have seen many many other cases where they did, and in this case there were young children involved - probably would have created an easy bar to get over. There were other investigative balls dropped as well.
2. Time - long time from crime to discovery of bodies. Absence of evidence is not evidence of absence, but it definitely helped CM.
2. The crazy schedule, delays, time from the end of the prosecution case and the completion of the defense case, and overall lack of continuity could hurt some jurors ability to have maintained the big picture of circumstantial evidence clearly in mind.
In the end, I don't think the defense recent shenanigans really are going to make a difference one way or another. I really believe these jurors have made up their minds one way or another. They either believe in the concept and weight of circumstantial evidence, or don't. If the former, there's a few 2-ton bricks in there for motive and consciousness of guilt that will convict him.