We get so tired of explaining the difference between skin cell (touch) DNA and other DNA that I am not going to o it again. However, I will repeat that although it was DNA from an unknown person, it does not necessarily mean it had anything to do with the crime. Skin cells are so easily transferable and omnipresent that unless a donor is identified by name, it is pretty useless.
A GJ means a lot in our legal system. While they are not the ones who decide guilt or innocence, they do determine whether there is sufficient evidence to bring it to trial. In this case, they did. It was the DA, a puppet of the politically connected defense team, who lacked the courage to do so.
Calling a GJ meaningless is an affront to our justice system and to anyone who serves on one.