I believe that's correct, too, but he would have to be Acquitted on the Stand Your Ground basis; otherwise, he COULD be sued, and there's always Holder's People who would slap a "Civil Rights" Charge on him, even if he is Acquitted on the Murder II Charge.
The value of the whole case is simply to pander to the Black voters for their votes, and for their "justified" outrage (that's been ALL that is the basis for this Case since the beginning).
The distinction hinges on whether or not Zimmerman obtains a finding of "immunity from prosecution," which, at this point, has to come from a judge. The immunity is supposed to prevent arrest, detention, and all form of prosecution. But Zimmerman has been arrested and detained, and is being prosecuted.
If the case proceeds to trial, and he is acquitted by the jury on self defense grounds, then he does not have immunity. But, if he wins a Motion to Dismiss on the basis that his use of deadly force was justified, then he is immune from civil suit. Holder can still charge him, but that would be a more bogus charge than the one Corey has applied, because Holder has to allege the reason Zimmerman shot Martin was racial animus.