I wouldn’t be surprised if they were all, or nearly all of the hmmm, ‘African-American’ persuasion
If three or more of the accused six officers are black, it’s not going to be a simple trial that includes “violated the deceased’ civil rights” with a slam dunk conviction on that charge alone.
If “racism” wasn’t a factor in Gray’s death, but massive incompetence was, their trials will be very complex & messy affairs.