Wow, significant find!
So even Parks acknowledges that MB was advancing on OW. Okay, granted, Parks wasn't a witness and doesn't claim to be, but he does have reason to have inside knowledge of what the witnesses are saying. He admits there were blows at the car, and he admits that MB was advancing on OW. Does anything think Parks would admit to those things if they weren't what happened?
If that's what the witnesses are telling the GJ, and if that's consistent with the physical evidence, I just can't imagine that any GJ could find probable cause for an indictment. Every day, we discover more things supporting "justified shoot" and fewer things supporting "racist cop shoots innocent teen for no reason." To the point that, as someone said above, there's virtually nothing in the MB side's bucket.