Poseidon's request
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1c - What is the meaning of the trace on the bullet?
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the three components
steel
fabric glue
and leather
are only together in one type of object
a steel toe woork boot
after fragmenting on the pavement the bullet fragment impacted into the killers steel toe wook boot
the metal plate in the toe of boot richoched the frag to where we found it
this means the killer has a pair of boots with a dented plate in one of them, this also means the vics dna is in the dent in the killers shoe
the adhesive on the frag is unique to the wolverine boot company 
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side question
Did the bullet ricochet from the seat into his head and stay there?
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the original assumption was that he was shot in the car, but this was not the case
the bullet richoched off the pavement
he was shot while laying on his back on the pavement
a small peice of the fragmented bullet bounced back into his skull
the rest of the peices flew outward
the peice re-entering the skull was the clue that he was shot outside the car and not inside
because there is nothing inside the car that is hard enough to fragment a 9mm bullet
and yes, the jacket fragment stayed in the scalp
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no new options are avalable