I didn't perceive a lot of worry. O'Mara made his position fairly clear to me:
1. The state is in the sole position to decide what case it puts on.
2. If the state decides to focus solely on the ~5 minutes of the incident, then those ~5 minutes will be the focus for the defense. W11, W6, Zimmerman's injuries, the lack of non-gunshot injury to Martin.
3. If the state decides to paint a picture of Martin before the incident, then he is prepared to make certain that the jury has the information they need to get an accurate picture of Martin as he came to this incident.
When you add in his pleadings you also add:
4. If the state chooses to make accusations against the police investigations, he is prepared to arm the jury with information regarding how the investigation was handled and the individual officers' professional opinion how it should have been handled.