Martin’s DNA absent from the gun means that it was Zimmerman doing all the bleeding. Which is the story he told. Nose and head and that blood smearing and spraying in random places and directions. This suggests that at some point zim might have tried to protect either his nose or head or both with his hands
Bottom line, though, is that it confirms that zim was doing the bleeding. And that supports his version of the events
The expert said he specifically could not exclude tm’s dna from the dna samples on the holster. IOW the governme can not say tm touched the holster!
FWIW: The samples were from slide, grip, trigger, and holster.
The grip had Zimmerman and some undeterminable party’s DNA. Martin was excluded.
The trigger wasn’t interpretable.
The slide had a male, neither Zimmerman nor Martin could be ruled out.
The holster had mixed DNA, Z was the major, Martin can NOT be ruled out as the minor conttrbutor.
Much like shooting an attacker with a knife, in the head after you've
been cut a few times. There is no defense to the knife wielder because he could
not have caused the wounds with his brain blown out, or heart blasted into pieces.