Yeah, I agree on the 1st degree. Maybe what he did was premediated murder. But they could build a rock solid case on the unintentional forms of murder in a way that they couldn’t with any intentional murder.
I don’t know what else the defense could have argued. I’m a bit pleasantly surprised they didn’t just find as many excuses as possible to bring up drugs and try to get the jury to associate Floyd with a drug addict who would be easier to dehumanize. Cynically, I don’t think the path to victory for Chauvin was ever going to be a logically convincing case - it was going to be to find a way to get the jury more emotionally on his side than Floyd’s. I guess it’s a good sign that the defense didn’t go that route, but went for the option of hoping that the jury would have a very high threshold for reasonable doubt.
Maybe the defense could have also tried harder to find more expert opinion arguing that Chauvin’s actions were justified, but it’s possible this case was so toxic that a lot of experts weren’t going to go down in history as someone who testified that Chauvin was right to kneel on Floyd’s neck (also just possible that Chauvin’s actions were so egregious and so far out of the playbook that they couldn’t find anyone reputable to testify regardless).