We know Zimmerman flipped him because he said so and because the wound is in the chest. The location of the body, in both the photo taken by Manalo and the final evidence chart, places the shell casing to the right, or south, of the body. In neither of those positions is the shell to the north of the body, where it should be if Zimmerman was on the bottom. If Zimmerman was on top, crouching down, and shot him in the chest, Martin could have rolled onto his stomach in pain, or Zimmerman could have rolled him over for any number of reasons (to frisk him, to hide his face, out of fear, etc). The fact remains that the shell casing is south of the body, which as you said above, means the shell ejected to the right. The head is facing the sidewalk. This puts Zimmerman on top. Now, of course the defense will say that someone kicked the shell casing or that Martin moved after he died. But that's why Manalo's photo is so key. It has the flashlight position clearly marked, which means we can place Martin's body EXACTLY after death. There's no reason why the shell casing should be south of the body, right? So what you're left with is special pleading where you posit a series of moves, none of which are in evidence, to explain this away. Much like how Grim is adding seconds to the timeline for George and subtracting seconds from Jenna Lauer's timeline in order to wave away this missing two minutes. What we got, to get back on track, this week, was that there's two missing minutes for Zimmerman and that the forensics, thanks to Jon Manalo, will show Zimmerman on top at the time of the shooting, just like several witnesses say they saw.
"The shell casing is to the right, the person on top is the person who got up".
That's going to be powerful in a closing statement.