You skipped the obvious. What if he died at the scene of a drug overdose?
I haven’t watched the trial I’m only speaking hypothetically. I did poke around a bit on the innerwebs and although the two autopsy reports I saw ruled it a “homocide” the facts cited in those reports don’t seem to bear it out. It looks like George Floyd died of a heart attack some time after the incident with Chauvin. They say that Chauvin’s actions contributed to the heart attack, but so did fentanyl, his lung condition (if I read that right). I’m not seeing anything like direct causation. IMHO, it goes without saying.