If you look at the context of the statement, it’s more an expression of sympathy. The decision to call it an appology, then imply that it was an admission of guilt was Crump’s, and he was shouting that from the rafters 24 hours before Zimmerman said anything. If “the truth” is what’s necessary to resolve the issue, then Crump needs to resign from the case.
Mr. Zimmerman has been swimming in shark-infested waters since the news of this case broke. Of course Crump would take any statement of sympathy from Zimmerman and distort it into an apology, if not a confession. There's no way you're going to get Crump out of the case. He is "zealously" pursuing the case of his client. There is almost no limit to what the Court will allow in zealousness on behalf of one's client.
I say again, if Zimmerman were my client, I would not permit him to make any statement that could possibly be construed as an admission of guilt.
Nos genuflectitur ad non princeps sed Princeps Pacem!
Listen, O isles, unto me; and hearken, ye people, from far; The LORD hath called me from the womb; from the bowels of my mother hath he made mention of my name. (Isaiah 49:1 KJV)