One "thing" that has been overlooked and not mentioned in this thread is the fact that a STYLE does not win a fight. The one element I find that prevails in such encounters is THE MAN who is fighting whether it's BJJ, various jiu jutsu, karate or just a really tough guy.
I taught, in my dojo, that if you are on the ground you have only around 6 seconds max to regain you feet or you could be in a dangerous situation. Whether from broken glass, rocks and especially friends of the attacker, it's never a good place to be in a bar or in the mean streets.
As a cop I once broke up a fight where two idiots had gotten into a fight. They were so incompetent that neither hurt the other at all. However I had to take both to the infirmary due to cuts that exposed bones and tendons. They were lucky as some of the cuts barely missed arteries. The ground was littered with broken glass, stones and broken pottery and they were rolling around in that stuff. And bad dudes seldom are alone.