I would say that the Jackson/Sharpton factor is absolutely crucial to how this all plays out.
If one of them gets involved, the complaints of blacks has "street cred" and it really heats up.
Contrary-wise, if neither of them comes, I think the black anger does not reach critical mass.
I am sure that the reverends are agonizing over whether or not to put their "credibility" on the line.
If the Revs don't show, the indictments must go.