I would advise you don't take any advice from anyone on this forum who tells you to use your gun. Take a law class. Maybe get an opinion from an attorney. The only advice I can give you is that you don't use your gun unless the threat is so dire that you're willing to ruin your life. Just ask GZ.
Regarding GZ, lets not forget that he was a bit rash himself, which got him into more trouble than he ever dreamed.
Whether he ended up getting ambushed by the kid, or whether he stalked and confronted the kid, either way, he had no backup, and he was in way deep over his head.
The disadvantage of CCW is that you cannot draw very fast, and your assailant cannot see the weapon therefore it does not serve to deter him. With OC you can draw faster, and with the assailant seeing the gun he is sometimes deterred. That's the problem with the CCW laws that require you to keep the weapon concealed at all times.
In GZ's case I would have drawn my CCW weapon the second I saw him approaching, if that's what really happened, to avoid getting pommelled and the risk of being beaten to death first and having the gun wrestled away.
Caveat -- we don't know what really happened in the GZ case and we may never know.
But I agree, that GZ got himself in way over his head, trying to play cop when he is no cop. Ergo playing cop is not a good idea. Ever.