I believe this was an event that spiraled out of control after a heated argument. I see more reason for her to spiral than him.
Are there a lot of cases of familicide that are preceded by a heated argument over something like this, ones that are comparable to this situation, regardless of whoever you think is most likely to have killed the children?
I will admit that sometimes familicides, usually when it's only the children killed by the father, can be preceded by marital separation and the father not wanting to hand back the children after visitation.
I really don't think there's going to be anything to verify, or even support, this defense by CW which you are choosing to argue from his side...which technically is not playing Devil's Advocate but is more taking a particular side in a debate and arguing it as strongly as you can regardless of your alignment to that side. I'm not bashing you, I'm just saying.
CW's actions that night don't support anyone but him being a killer that night. Stats will back this up.
CW's actions after the event don't support anyone else being a killer that night. Stats will back this up.
CW's statements to media do not support anyone else being a killer that night from a statement analysis and behavioral analysis standpoint, both of which are based on numerous cases of study of guilty and innocent behavior and word analysis.
The physical evidence in the house and bodies may or may not be able to prove either way.
So he has 3 out of 4 running against him even before we learn about the physical evidence.
If CW had left the bodies in situ and enabled a full forensic autopsy, then there's a high chance he would have been proven innocent of the murders of the children by hard evidence. Unfortunately he put the bodies in oil which has likely destroyed that evidence.
So what's left that could show his innocence in the murders of the two girls? Placement of cadaverine and other forensic evidence and whether Shanann was killed in one of the girls' rooms vs the main bedroom or elsewhere in the home? And maybe stomach contents if they can possibly show that the time of death for the girls was very close to that of Shanann...if it shows a few hours earlier or a few hours later, he's going down. If it can't tell if it's close or a few hours, it's really clutching at straws.
We have so far about 3 or 4 people on these threads who've been either appearing to feel it's possible for Shanann to have murdered the girls, or in your case simply choosing to take that side in debate. How many people have been in these threads, a hundred? That's not good odds for getting one of them onto a jury, and a court case is likely to be a lot more damning due to far more evidence being presented and in much better ways than we can present and examine here in this forum.
If you look at all of this, and then add on Gitana1's post and imagine the prosecutor making a summing up like that....CW's going down.
Edited to fix a typo.