Here's what I think:
Zimmerman had no reason to follow the kid in his car, to call the cops, to stop and get out of his car, or to try to shadow the kid anywhere. There had been robberies by young black men in the neighborhood? Great. Guess what, the presence of a young black man in the neighborhood doesn't indicate that he's going to commit a robbery.
Zimmerman had no business waiting around to talk to the cops or trying to meet them anywhere. Once he's called the cops, let them cruise through the neighborhood. He's not a cop. The cops didn't need his help. I think the other 911 calls demonstrate ill-will.
Whatever happened between his call and the subsequent call is unclear. The only story available is from a man with every incentive to lie and the cops did a shit job investigating. They were inclined to believe Zimmerman. They appear to have led the neighbor witness a bit in their questioning.
Did Martin double back and assault Zimmerman? Did Zimmerman grab Martin first? Did Zimmerman approach with his gun drawn and get slugged by someone who wasn't going to run from the gun? Don't know. What I do think is that the story that Zimmerman was on the receiving end of MMA style ground and pound for at least a minute then was able to draw his gun and get off a shot isn't believable.
I think the reason Zimmerman's attorney didn't try to get Stand Your Ground immunity is because of the nature of that law. The burden of proof falls on the defendant - so Zimmerman would have had to prove to the judge that he was in fear for his life. I don't think he would have gotten it - and I think opening himself up to making any more statements would have been bad for his defense.
I think the defense played to racial bias and a jury with 5 out of 6 white women was going to be sympathetic to that argument.
And I think the little wanna be pig will be on the opposite end of vigilante justice eventually.