I don't know...what kind of sentence would that carry?
Probably a fine for a first offense.
The problem is, any charge that sends him to jail, you have to fabricate things that happened in order to convict him of it.
Unless you believe he swung first and was on top, but that looks not very likely.
But the "he started the situation" thing isn't good enough to convict, that doesn't rise to manslaughter.
There is simply no way that not listening to the dispatcher = reckless conduct when he was being attacked. The instance of him being negligent or reckless by not listening to the dispatcher is severed once Martin intervenes and acts wrongfully. Any liability that Zimmerman has for not listening to the dispatcher should be analyzed on its own and not for the result of what happened once Martin confronted him.
Zimmerman following Martin.... that could be a crime (though a minor one).
Then Martin commits an act against Zimmerman. Bam, everything else that happened previously is irrelevant to the next question.
NOW is where we ask, did Zimmerman act recklessly? Again, we are asking only in relation to how Zimmerman acted once Martin attacked him.
No one can point to any reckless behavior from that time.