Of course, I am pretty sure that doing so would have opened the door for the defense to impugn his character through his school disciplinary record and the reason why he was in Sanford in the first place.
Blacks seem to be incapable of admitting that he was a punk.
That reminds me of something else: I don't know whether RJ's "rapist" comment on the stand was new to MoM/West, or if she'd said anything similar in deposition, but it would have allowed the defense a way to raise the suggestion that TM attacked Zimmerman without impugning TM's character (jurors in self-defense cases often have a negative emotional reaction when the defendant attacks the character of the decedent, even if on a factual basis such evidence should favor the defendant). I wonder if the jury could have felt more positive about Zimmerman if the defense suggested that Trayvon may have been scared of Zimmerman not because of anything Zimmerman actually did, but because of Rachel's suggestion that he might be a rapist?