The difference it makes is it proves there was some sort of struggle at close range. I don't have a source at the moment but the percentage of gun fights that occur within 20 feet or less is around 90% the gunpowder burns are not surprising.
If you were in a case where you had to use your gun you typically don't pull it out just to show it around. You pull it out to use it and are in fear of your life.
The last part of what you said is very true though we don't know what happened that led up to this.
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