What about the people on the street witnessing the events, what were their observations.
There are witnesses that say he had his hands up and was surrendering and others say he was not. Some say there was no struggle at the car but we know there definitely was. His friend said he was running away when he was shot (also already debunked by forensic evidence).
I think you are putting too much weight on eye witness accounts, they are often very unreliable and the media tends to pick the ones that sound best to keep a story going / feed controversy / get viewers. What carries more weight is the forensic evidence - if it's shown he was moving toward the officer for instance.
But also the different vantage point could mean that someone with their arms outstretched could quite easily have appeared differently to the different onlookers so they don't have to be 'lying' (though some clearly are). They will all be interpreting what they saw and then someone else will interpret and put together all the disparate stories to piece together a likely replay of what actually happened.
Also worth bearing in mind: going on the news and publicly saying "MB was surrendering" if you live in ferguson is easy. I think it would be a brave person who stands up there and says the opposite so the full and fair evidence has likely only really been heard by the grand jury.