That's a distinct possibility.Of course the question could be asked "did he try to bash Zimmerman's head in simply because Zimmerman had a gun and Trayvon was scared?" We don't know that for sure...at least *I* don't.That's why exposing the kid's past is key.If he was an honor roll student,no trouble with the police,no evidence of booze or drug use,no gang activity then that wouldn't bode well for Zimmerman.If he was the opposite (which seems distinctly possible) then that bodes very well for Zimmerman.But if the prosecution's gonna make Zimmerman's past an issue the defense can *certainly* do the same with the kid.
If someone has a weapon, I do one of three things: (1) create distance between me and the weapon; (2) find cover (if a gun); or, (3) control the weapon. I DO NOT IGNORE the weapon/weapon arm. I do not take him down to the ground to bash his head in, unless I am fighting with what I believe to be an unarmed man.
The most likely sceanrio that fits the data: Martin initiates the assault, takes zimmerman off his feet, bashes his head, the weapon is exposed (shirt rides up exposing the IWB carry position), both go for the weapon ( or zimmerman thinks martin will now go for the weapon having seen it), a struggle for the weapon ensues, the winning operator with his hand on the grip fires.