Here's the tricky part about the blood angle. I don't see a scenario where SA is leaving blood in various places from a finger cut, but a victim is not leaving any from at least two bullets wounds in the head. If someone was able to remove that blood from the garage, why wouldn't they think to remove... The pile of bones in the fire pit, the blood in the rav4, or the burn barrel left overs. My point is that it doesn't add up.
Well, think about this. Suppose the murderer is wearing gloves ? Now, if you had on a pair of cloth gloves or something that absorbs blood, such as typical work gloves, the blood doesn't necessarily drip. But anything you touch, might get transfer blood on it. Try it with a pair of gloves if you want, using something of the same consistency as blood and not actual blood obviously
You will see what I mean. That would explain to me how there are no prints in the van, but blood smudges in places you'd expect -- like near the ignition. That is a place where his cut right hand might make contact with the area around the ignition. I'll have to find the picture of the smudge and try to examine it better and I can't remember where exactly avery's cut was on his hand, but I believe it was the knuckles.
Once again, let me say that I am not saying this is what I believe happened, but rather just explaining what I think is plausible.
In terms of the bones I have been thinking about that alot, because it's the one piece of evidence that does make me suspect Scott Tadych, Chuck, or Earl might have been the killer. I agree that it just seems unlikely that someone would leave the bones right in their fire pit so it could be connected to them. But it is a very good plan for someone taking advantage of the fact that law enforcement thought it was Steve from the getgo. Finding some bone fragments in another location - near the Janda place I believe - seems to make Tadych a likely suspect if that was the case. Not that Chuck or Earl couldn't have done the same thing.
Leaving the car on the property is also seemingly the dumbest thing he could possibly do. But again fits the framing via someone else on the property -- not just police.
Also, we don't know if the bones in the pit were just sitting out. Were they possibly buried ? Is it possible that someone might think that if they buried them in the pit they might not be discovered ? I don't know. If they were indeed on the top in plain sight, then I think you are right. But I just don't know if that was the case. A cadaver dog can smell remains buried 15 feet underground. I wasn't aware of that.
So I would like to better understand how they found those bones and if they were buried or just out on top. How some bone fragments got to the other locations ? that's a good question. I think it points to the other suspects possibly framing as I said.
I am going to try and find more info about the bones if I can.
EDIT - Forgot to mention why victim wasn't leaving blood everywhere. Say that Rav4 is in the garage. I am assuming this is the case, as he'd not want to have someone say they seen the car outside his place at that point. So, in the garage he puts pillow or clothes or something over her head, shoots 2 times. No blood spatter. Now they move the body into the Rav4. We know that she was in the Rav4 before burning because there is blood in the Rav4. Drives the Rav4 to the burn site -- why ? so that they aren't dripping blood all the way to the burn pit , which means cleaning up more. At the burn site the body is removed and put on the fire. Whatever gloves you were using to carry here, onto the fire. Her clothes as well, which might have been used to sop up some blood on the floor etc.
After she's on the fire, at some point they clean the garage floor.
I think all of that is plausible and makes sense. And... the only places there is avery blood is where it makes sense that his knuckles might come into contact with something -- ie ignition. Make sense ?
Also, I don't think anything I said here requires any sophisticated means. A pair of gloves, some bleach, and a fire. right ?
example of work gloves with cloth on knuckles, which is where avery's cut was --
http://www.harborfreight.com/media/...b33525d08d6e5fb8d27136e95/i/m/image_18774.jpg