Like I said, I don't think the evidence points to this being the absolute conclusion. There are just too many witness accounts that say so many different things. Once again, it goes back to the point that we will never really know what happened.
Personally, I think Brown got into an altercation with Officer Wilson, in which, he tried to get his gun and punches were thrown. After the initial confrontation, I think Brown initially ran away but then tried to possibly surrender (maybe), based off the evidence I have seen, or he may have charged Wilson at this point, we don't really know. Now if Brown charged again, I understand Wilson's actions, it's the witness testimony that Brown had his hands up trying to surrender that makes this disturbing because that could have happened to.