As reported by the police investigator, I still don't understand why Zimmerman never told Martin who he was. I wonder why he didn't...?
For the same reason he didn't properly pursue a suspicious person - he's an untrained idiot. And untrained idiots who pack heat are responsible for the results of their actions.
Sadly, I don't think that's going to be the result. In my opinion this will be a case of "social justice" either way. Either the jury can't bring themselves to put Zimmerman behind bars for life because the case for murder is so weak or the jury is going to convict so that their town isn't subjected to an angry mob.
This was an open and shut case for manslaughter. When armed, you need to make sure that you don't get yourself put in a situation where you are going to get your ass kicked. Zimmerman made the choice to pursue and he did so poorly. He was smart enough to get a permit to carry a gun and but wasn't smart enough to educate himself on how to handle situations while armed.
The only caveat in my opinion is whether the evidence shows that Zimmerman was reasonable in thinking that Martin was actually trying to kill him.