Ok, i will summarize.
The neighbor's video of chris loading bodies? Well it was examined frame by frame and this Armchair detective guy (and now actual FBI and CBI) determined there was at least one other person helping at that truck. There are "courtesy lights" on the side view mirrors, which always turn on together. Occasionally the passenger one turns off, and they were able to show that happens only when the door opens or when someone stands in front of it, obscuring the light. It is likely that two (and possibly three) people were required to kill Shanann, who would have fought mightily. It is also likely that Cece was smothered in the house and loaded into the truck in a trash bag, but Bella can be seen being lifted into the truck by CW. One accomplice on the passenger side assisted in loading SW into the truck. That person then also sat in the back seat of the truck with Bella, as evidenced by the hand-held cell phone. Very distinctive. All of this now accepted by the DA and various LE agencies, who are behind the delays in auctioning the house. They have, for the last two weeks been setting up physics measurements, measuring for example lines of sight from the doorbell cam, and from Neighbor Nate's cam. Neighbors in the area have reported that on reddit.
So let's just say you accept the idea that Nichol Kessinger and her "buddy" Jim Gotuski were helping him, or maybe somebody else entirely, then what was the plan?
Well it turns out that in the summer of 2017, another one of Anadarko's batteries blew up in Mead, CO, less than 20 miles from Frederick CO. It made huge news because the explosion registered on seismic scales. Firefighters who tried conventional methods of containing the fire were stymied by oil's resistance to those methods (water for example, INCREASED the fire). Firefighters died, i believe, as did men who were working at the site when the explosion occurred.
So CW and possibly NK (who had been googling the Watts since about a month after the Mead explosion occurred, and before she met CW), apparently concocted a murder for profit scheme.
They would kill SW and the girls and "store" them at the site, then stage the site for the tragedy about to unfold. CW took his girls in SW's Lexus SUV to Cervi 319, to meet a friend who was going to hand over an Amazon firestick. Friend leaves, CW out there alone on Friday. He told the friend he took the day off to take SW to the airport, but that was not true. Out at Cervi, he dug a shallow grave, started a small oil leak, took pix and reported it to NK, who was the OSHA safety officer. She then reported the leak to another co-worker, claiming the alarms did not suggest a serious leak, but maybe he and CW could take care of it Monday morning. That guy calls CW. CW says he'll take care of it himself.
But now the leak is on the record.
They kill SW and the girls, putting one girl in each tank, Shanann in the shallow grave. Why so shallow? Because they only needed to cover her up, hide her, not lay her to rest. Presumably CW would have dug her up Tuesday morning, dressed her in the jeans found at the foot of the stairs, and propped her into the Lexus, which an accomplice would have driven out. Text messages from Shanann's phone and Chris' phone would have been sent, to the effect of "i know you have been cheating on me you asshole. Where are you? We are going to settle this NOW."
She would theoretically have been at the wrong place when a devastating explosion occured. Of course CW wouldn't have been there, running late or something. The gasoline over the car would have guaranteed an accelerant on the car, there would have been a GIANT explosion, leaving nothing but a crater, certainly no remains. CW apparently googled "long fuses" and "remote detonation". And CW and NK both knew that Anadarko, in violation of government sanctions imposed on them for Mead, CO, never fixed the safety issues at their batteries. CW would have sued for billions.
If only Scooby hadn't shown up.