I return constantly not to what is possible but what is likely. Tragically we have seen all manner of evil in prior cases and this one is up there, but I think most of the speculation here is arising out of frustration, in that we don't know more and indeed this is utterly senseless. That being said, Occam's razor would have me think this was a meth-induced home invasion. My theory, one or two individuals, one at the door. Guns, not necessarily with murder on the brain, but certainly terror. A knock on the door would have given them free entry. It seems that James did not open the door fully, which may have lead to the frame being kicked in or shot in, entirely possible those two shots from outside wounded James on the inside, and that is when the events went from a terrifying home invasion to a macabre murder scene. So much we don't know. Were interior lights ever on? It was 12:30 pm or later. Was a TV on? Quietly? Loudly? Imagine the chaos of being awakened to something that doesn't make any sense....