Good point! I was thinking the search of the Dermond house this morning was totally pointless. If LE had turned the property back over to the family, no new evidence today would hold up in court because of contamination of the crime scene (surely the family had the house cleaned when they came for the funeral). It makes sense that it may have been staged to create anxiety in a person of interest.
So, unless LE has a head (so they know what the murder weapon was), then is it safe to assume RD was shot? To know for certain the murder weapons, without a head, LE must have found trace amounts of gunshot residue on RD. They never said he WASNT shot, they just said they found no exit bullets or corresponding blood spatter. But they also said they didn't think he was murdered in the house or garage anyway so perhaps that's why there was no bullet shell/casing etc. LE also stated there was no trauma anywhere else on his body. Again, RD would most likely have bruising on his hands at least (defensively guarding or holding his head) if he died of blunt force trauma. But, nothing. If he was shot, it would also explain the decapitation, as the overriding theory on WS and to Sills is that it was done in an attempt to hide evidence.
I can follow it all up to this point. If this were so well planned out, two people at least to commit the crimes, what idiot makes such a huge blunder in the commission of shooting their victim that, after they kill him and go undetected, they kill his wife, quietly boat FIVE miles out, weigh her down, maybe even tie her underwater to a tree, probably all done in pitch dark, and then all of the sudden realize they shot the wrong gun?!? Whoops! I better run back and 'remove' those bullets that will implicate me! This is the part that trips me up and makes me doubt the whole chain of thought....