For example, it's clear that the defence's case is centered around the notion that the cause of death was drugs not Chauvin.
I think the main focus for them is actually that Chauvin was allowed to do what he did (at least to a point) and that there is some leniency that can be applied here to a police officer making an arrest and having to use force vs say an ordinary person doing the same - wouldn't be reasonable for the store clerks for example.
Essentially Chavin probably has gone too far but from the defence perspective, they can try to show that in going too far, in the heat of the moment etc.. that didn't constitute felony assault etc...
that as a primary argument is perhaps better than just trying to go with placing it all on the victim. The drugs is obviously a key secondary argument here though and in itself can generate sufficient reasonable doubt - that only requires one juror to have reasonable doubt and have enough conviction to hold that position/not be pressured or swayed by the others and the defence can get a mistrial.