+100
The notion that Martin was so agressive that he jumped into a moving car stretches credulity. It's possible, but pretty unlikely. I get that Aborgman likes to argue the possibilities, but the realistically, this is very likely to have been the case that Zimmerman sought Martin out and percipitated the conflict.
I was a 245 high school defensive lineman when a guy who must have weighed all of 175 pounds tried to forcibly take my wallet from me. Smaller people can and do attack larger ones all the time. I'm not saying it happened here, but I would not dismiss the idea out of hand.
Zimmerman was not required to follow the directions of the 911 operator. As noted they aren't police and the local PD police also noted that the instruction does not have the force of law.
I also wouldn't doubt that the local police are dragging their feet.