I always found it little odd to bring up weapons and multiple opponents when discussing street fights and what style is best. If you bring weapons into it, it is no longer about comparing combat sports. Its like asking what is better vs 2 armed gunman; BJJ, Boxing, or Wrestling. None, because none of those are about self defense vs armed attackers.
When I imagine street fights I think of my younger days; 1 on 1 fight to settle beef, usually in a field or parking lot. Anything beyond that, multiple attackers, weapons, etc dives into the realm of criminal assault, and for that situational awareness and avoidance is far more usefull than a martial art.
The fact is, when you eliminate all of the other variables, in a 1 vs 1 street fight or a GOT style trial by combat I would take an MMA fighter like Khabib or JJ against any other combat sports athlete or martial artist.