None of that directly contradicts the witnesses' reports, save for that of Brown's partner in crime.
They saw what appeared to be the officer pulling him in to the cruiser, which was him leaning in. They saw him running away and putting his hands up, which the officer corroborates.
And, sorry, it has a ring of truth, a lot more than a 6 year veteran officer who has received service commendations decides to try to yank a 300 pounder through his window then shoots him for no reason in broad daylight in the middle of a residential street.
If, and a big if, the Facebook post is legit.