Towards the beginning when X's dad said "bruised and torn" my mind went to thrashing instead of precise stabs. I once assisted in a necropsy on a deer, an elderly woman had been using her bb gun to pop them in their behind to get out of her yard when they jumped her fence for like 40 years. This time unfortunately she missed as it turned to run and of all things a bb pellet went between the ribs and it died. That was my immediate thought on "bruised and torn", rage/hate driven stabs and dumb luck similar to the old lady.I considered that too, but I am thinking the coroner said stabbed in the chest (?) Would the aorta be quick enough? He would have had to strip the blankets down? I just don't get the 2 girls in one bed. It had to be done so quickly.
Two other thoughts imo, I keep wondering if KG had more wounds because in her pictures she appears stronger than the other girls and SG said she always wanted to keep up with her boy relatives regarding physical activity while growing up. Second, if he did incapacitate them he could have done precise stabbing.