The problem is videos can be very misleading.
Several people have claimed enormous pressure was applied to Georges neck. Others have said the technique does not require much pressure, there are several indicators in the video that little pressure is being applied, and that you cannot reliably determine the pressure from the video.
Now we have the "independent" doctor saying there is no evidence of pressure, because, well, there doesn't have to be any.
We have more and more exculpatory evidence piling up.
Remember all the claims that no police department in the country allowed such a restraint? They changed to "the restraint was not stopped at the right time" once the MPD policy allow the restraint was found on the MPD website.
There are now claims of long term heart disease, long term vascular disease, use of meth, use of fentanyl, and George was a smoker. All of that boosts the exculpatory claims.
There are claims George complained he could not breathe while standing up. That should be in a report somewhere. I will try to track it down. That is exculpatory, because the problem preceded the neck restraint.
George certainly acted impaired. The clerk noticed it, the police mentioned it, and now the ME is mentioning it.
All of that is exculpatory.
There is video evidence of George resisting arrest, both at first, and much more vigorously later, at the police attempt to put him in the squad.
It could certainly trigger heart failure; it is more exculpatory evidence for the police.
Remember how we were told, at first, that George was peaceful, and did not resist?
In short, there are now plenty of reasons to doubt the first narrative of police murdering an innocent, peaceful, man, in spite of the video.
The video could be showing murder, but it looks less and less likely.
And police officers have no idea, and aren't privy to the medical health of a person they encounter. You can't even ask anyone because of HIPPA laws. When I worked in Corrections, we weren't even allowed to know if the convict we were transporting was HIV positive, had TB or any other contagious disease.
Here’s a nice little article in Police Magazine outlining what an officer should do to avoid a restraint death.
Pretty much the opposite of everything Chauvin did.
https://www.policemag.com/524139/how-to-prevent-positional-asphyxia