Yes, all we absolutely know from the angular trajectory is that Brown was leaning forward at the time. He could have been either falling forward or charging forward, but the account that Brown was charging forward was put on the table by Darren Wilson and six of the witnesses, but the account that he was shot while FALLING forward was NOT put on the table by ANY of the witnesses. It is merely an ad hoc explanation. You can find ad hoc explanations for absolutely anything, to make anyone innocent or guilty per your design.
The bolded is incorrect. It was Darren Wilson and only THREE witnesses (and one of them actually said "I thought he was trying to charge him at first" which sounds like maybe not)
Then we have the other witnesses:
"and he started feeling the pain or something like that, where like he couldn't you know, pick up his pace because of the shot. "
"and then he started going down."
"like he was stumbling and like I said, the officer lets out some more shots and that's when he hit the ground.”
"and he just went all the way down as the shots hit him.”
“And so by the time I made it to where I could see what was going on, Michael Brown was on his knees.”
"it appears to me that he was just catching his balance."
"And next thing I know, I don't know where it hit, but when the boy fell"
"he turned around, and I'm assuming that he was just stunned, that's how it appeared to me. That
he looked down at his hands and he saw blood.
So we actually have SEVEN witnesses (not zero as you stated) that testified to some version of "falling forward" plus one more stating that Michael Brown was looking down at his wounds.