I see no reasonable doubt that knee to neck wasn't the cause of death.
Anything is possible. Some believe the video shows the knee not directly on the neck. While that is possible it is not reasonable from the video.
Look this decision wasn't even close. It is like saying a SCOTUS 9-0 decision was wrong.
You don't believe there was reasonable doubt (fair), and others do (also fair). And now we come full circle. There are those who say that the jury's conclusion that there was no reasonable doubt may have been influenced by things other than the facts of the case that were presented to them. Was it unanimous? Yes. Was it like a 9-0 SCOTUS decision? No.
A jury is made up of laymen with a rudimentary understanding of the law, and are very much susceptible to outside influences in their decision making. SCOTUS is made up of proven legal scholars who (are supposed to) understand that their job is to clarify the law and ensure it is applied as intended, regardless of their personal sentiments or the consequences. Our judicial system is imperfect, and one consequence of having a jury of laymen determine guilt is that other laymen feel that their opinions are as valid as those of the jury. Ultimately, this is the system we have and the jury gets to decide, not John Q. Public. That doesn't mean that the jury is right and people who disagree are wrong; it just means that what the people who disagree think doesn't actually matter.