True Crime Rocket Science is about discernment. How to tell the difference in the fog, in the smoke and mirrors, between what’s real and what isn’t? How to intuit psychological artifacts from the misleading miasma?
Many have accepted Watts’ version of taking the children to the CERVI 319 site [alive], and apparently also having Bella sort of run around at his ankles while he was transferring Shan’ann’s body from the bed, down the stairs, then backing out the truck and loading her body. Bella was sort of scampering around like puppy, and that was fine.
Some have found reason to doubt what to me is a the more likely of the two crime scene scenarios. It’s this idea of Shan’ann arriving home at almost 02:00, making up and having sex, but never taking a shower. Shan’ann ultimately never removed her make-up.

That’s one version of how that happened. Another possibility was that she was murdered before she could wash up and remove it. Presumably, had she been given a few extra minutes of life, that’s the first thing she would have done.

 It seemed like it was longer than two to four minutes. I just felt like time was standing still. I just couldn’t let go. It was like something else had taken over and I just couldn’t let go. I feel like I was in a rage. That is the only way I can describe it. Strangulation is a passionate type of thing but I don’t know how it could be passionate. It felt like someone was behind me. I just couldn’t let go…

It’s interesting how Watts describes the crime as some shadowy persona pulling his strings from behind him. Also the words he uses…  He can’t let go as if he’s holding onto something.

The last time he slept with Shanann, it all became very clear to him. “I felt like that last time sex with Shanann was a trigger point. So I woke her up and I told her that I don’t feel compatible.

This is very likely true. At some point having sex with Shan’ann triggered something in him where he realized he no longer wanted to have sex with her and be with someone else. Though this probably happened, it’s doubtful it happened on the night in question.
Fullscreen capture 20190313 195852
“I just wish I could take it all back” sounds like the sort of thing you say about something you said, that you wish you hadn’t, rather than something you did, that you wish you hadn’t. He doesn’t say:
“I just wish I could have them all back.”
https://youtu.be/APTjxdSHnkQ