why I wouldn't want a gun in this sitch
I might be tempted to use it as some here have advocated. And the other guys might have guns, or just enough courage to bum rush me. (Doubt I can cap a number of them and reload and cap more without someone getting to me) And now, whether it was lethal encounter before or not, I have made it one.
Because I don't carry a gun, I don't even consider doing this sort of crap. I don't go brawling; I don't get out of the car if my friends don't show; I don't stick around when I see the number. I do steer clear of this puerile crap; I do practice de-escalation and situational awareness; I do run when facing insurmountable odds.
We don't have all the facts as this a heresay case on the internet but from what we were told, I'd have to say that only one MA would have been a good idea: Track Fu. But not surprising that the victim wasn't smart enough to pull it off as he had already made several key(and potentially fatal) errors in judgment before it ever got to that point.
Most fights start standing up. Keep it there.-standup school
Most fights end up on the ground. Take it there.-ground school
Fights start where they start and go where they go. Go or take it whereever works best.-MMA