Also, Z shot him with one shot from a 9mm, not a howitzer. I don't know if sje's expecting gallons of blood, tissue and an exploded torso, but gun shhots don't always bleed so much. And dead bodies don't bleed at all.
And GSW analysis is a notoriously unreliable science. About the only meaningful info is where the entrance wound is. Once the projo breaks the skin, anything can happen.
Like I said, her musings sound like another internet expert pontificating on things she really doesn't know much about.
With rain washing over both, and the fight scene being investigated by keystone kops, it’s also not odd if DNA is hard to find.