IMO none of that is even close to feasible at all. Not even one bit. Why? Because that means both CW and SW would have had absolutely zero concern for the survival of their children. Both of them.
So, we have to suspend all logical and rational thought and believe that not one, but BOTH of them tossed aside all concern for their children. She's so enraged over a marriage she already thinks is ending that she strangles both children instead of attacking him, while 15 weeks pregnant and not feeling well, and he's so enraged and heartbroken over his children's deaths that he strangles his wife while his babies lay there dead or dying. He doesn't call 911, there are no signs of a struggle save some sheets on the floor and some in the trash that matched the one he IMO wrapped her body in... and no one hears a darn thing except a dog.
Then, he quickly gets over his rage and decides to pack up the bodies, load bags in his truck, make a long drive with 3 bodies in his truck, stash his precious babies in oil, dig a shallow grave, go to work, act unconcerned that they were missing until LE was alerted, then appear on TV lying like a bad rug looking as if he hadn't shed a single tear while praising the shirt his wife bought him that he likes so much. And why? If he had called 911 she would have been arrested and he might have saved his children.
Not only did both of these people become completely unconcerned with the deaths of all of their children the same night, but both of them had to have turned in to cold blooded murderers on the same night, using the same method (from what CW claims). Both reacting out of rage. And no noise, no knocked over furniture, not a conclusive scratch on him, no sign of anything but his clean smiling face, 3 bodies, and only his word that it was her fault.
IMO I cannot understand how anyone can think she's the guilty one by default or it's up for grabs even though his story is completely ridiculous, he lied multiple times, and many experienced LE who have seen a LOT more than any of us have are convinced that he killed them all. I will never understand it. No matter how much some don't like her, I can't fathom suspending reason and logic for the word of a known liar and murderer.
Again, all JMO.