The witness statements vary wildly in the events which they describe (as posted by phart above). Some agree with most of the policeman's account, some with parts of it, some seem to contradict it all. I guess it's only natural when witnessing something like that. They certainly don't all describe similar events to Brant's (succinct) description, which is what I highlighted - what he seems to have done is summarised the policeman's account of what happened, while ignoring the contradictory witness statements. I've no idea who Bob McCulloch is, by the way.
This guy? http://www.huffingtonpost.com/2014/11/24/bob-mcculloch-ferguson_n_6215986.html
The St. Louis County Prosecuting Attorney seems a likely choice if you're looking for impartial opinion on this topic.....
A decision which has been questioned by that bastion of radical thinking, the American Bar Association.