A key bit of evidence supporting the death-match over the gun is the fact that only one round was fired, and no second round was chambered or jammed part way. The second round was still nested in the magazine, indicating the feed cycle was disrupted by hands wrapped around the pistol’s slide. IOW, a wrestling match over the gun.
I read you have to take into account the type of gun it was (polymer framed) and when fired with a limp wrist you get a FTF.
It means GZ didn't gun down TM at a distance, so murder is off the table.