He definately was an accomplice to a robbery, and later to the assault.
And what about the bracelet that Johnson was wearing at the sacene of the robbery, but was missing when he was interviewed by the Feds after the assault ?
Wasn't that bracelet found on the roadway ,just outside Wilson's passenger door ?
I believe that it was bagged and tagged as relevent to the assault / fatal shooting , thereby implying Johnson's role was less than passive and compliant.
Obviously , the FED takes care of those who help build up racial animous .