It was homicide. So there is only one possible defence, but can't see where it's coming from after the police evidence.That's a very good point. Not sure the defence will use it but they may well do. Nelson may well think that if he proves death was not a result of asphyxiation that may be enough for an acquittal.
I am hopeful that there are enough black people on the jury to get at least a hung jury. In that event I believe the da will push for a retrial in the hope the police federation will not pay for a second defence team for Chauvin. This trial has cost a million dollars for the defence.