The only gap I see so far is that Sow Belly Brownie doesn’t look to me like he has a bone-breaking punch in him. Yeah, he’s a full grown lard ass but that doesn’t mean he’s strong or quick. I have much personal experience putting lead bottoms like him on their backs and hard knuckles and high arm strength is rare.. While he might have thrown some haymakers my suspicion is that he slammed the Cop’s head in the door and that would more readily explain a broken cheek bone?
I've read elsewhere that Darren Wilson might have popped the door of the SUV open, started to climb out, and had the door spring back into him, catching him in the face.
Whether the yute had a hand in the "spring-back" is an open question.