If he wasn’t in his car, and had not been in his car at the time of the incident, there is NO REASON TO MENTION THE CCW OR THE WEAPON!!!!
I see your point but what if the police ask you a direct question like "Do you own a gun?" (highly probable!) Should he have lied? Should he have claimed 5th Amendment right? No matter which way it goes he would have had to admit to these items and the questioning involved in a reported 'shooting incident' would have gone there.
One would think that an unfired weapon, secure in the car of the reporting citizen, would not have led to this outcome, but 2am arguments are frequently known for stupid outcomes! Just one of many reasons that I am never outside at 2am and won't be even this Tuesday night! Like others, 3 days of incarceration would lead me to ask for more than these slight compensations but there may be a back-story as well!