Worth reading, it's short, two counts, one for murder (or "knowing"), one for bodily injury (or "knowing"). I see no allegation of conspiracy, because "knowing" is not the same thing as "agreeing to commit or facilitate commission of a crime."
What defendants are accused of knowing is that a deadly weapon would be used or exhibited. This "knowing" does not constitute a criminal act or conspiracy.
The charges also allege the offense was committed as a member of a criminal street gang.
The indictment you linked identifies ten dead in the first section, any idea who the tenth dead man is?
After reading the statutes they were indicted on, I wonder if the assault charge would stand if there wasn’t evidence of directly assaulting a victim? The murder statute does have a specification for deaths that result from criminal activity, but I don’t see that in the assault statute.