Staircase Documentary further thoughts

Background from my original post a few days ago, read more here

Staircase - What was it about?

Staircase [ a Netflix documentary] discusses the death of Kathleen Peterson a woman who live in Durham, North Caroline, until her death in 2001 and the subsequent prosecution of her husband for first degree murder and the story as the trial develops. Also we find out what happens after the trial up until the end of the documentary over 15 years later. Kathleen was found dead at the bottom of the staircase of her home by her husband Michael Peterson who rang in the call to 911.

Reasons why Mike is guilty
Again this youtuber in the comments posted this

At some point, he realized how devastating - and mortal - her wounds were, and he let her bleed out long before finally calling 911 at 2:40am. Problem is, the autopsy results (red neurons in the brain) and testimony from both defense and prosecution expert witnesses show that Kathleen was dead at least 30 minutes to 2 hours before Mike called 911 at 2:40 am when he said she was 'still breathing'.

I believe while they were at the base of the stairs trying to assess the situation (or possibly struggling in a panic), Mike realized she wasn't far off from losing consciousness (long before ever calling 911) and actually led her up 4-5 stairs, then purposely let her go (or shoved her with his foot, which explains his bloody shoe print on the back of her pants legs) and allowed her to fall down the few steps which ultimately rendered her unconscious and incapacitated, which is ultimately what he wanted at this point.

It still took 20-45 minutes from that point for her to bleed out. There was a ton of blood in that stairwell, and some kind of struggle and/or clean-up (to make the scene match his narrative) ensued. I think that explains the blood all over his clothes/shoes. But Mike's twisted writer's mind kicked in (those creepy book manuscripts housed at Duke University that Kathleen's sisters found & copied are quite revealing), and he saw another opportunity (like Germany) and seized upon it.