I’d like to give a purely speculative example of evidence we don’t know that would easily support the depravity charge.

What if Martin were shot in the back?

I’ve speculated on that point before. He was shot with a 9mm at very close to point blank range. Even hollowpoints at that range should go through, leaving an exit wound. One of the reasons I’ve been anticipating seeing the autopsy report was to see if there was a second (exit) wound and what the data regarding the two wounds showed.

Another possibility is if it is shown that Zimmerman was on top and in control. How? If the bullet was found tunneled into the grass on which Martin lay it would tend to support this position.

Note that both those are speculation. I’m presenting them as examples, only, of evidence we DO NOT HAVE that would give support for “depravity”.