Well BJJ and Judo both focus on live sparring or Randori.
As far as multiple opponents its gonna be hard for anyone or any style taking on multiples.
Most Judo/BJJers also take Muay Thai or Western Boxing as well...where they fight single opponents.
If I can throw someone on cement or do a Matrix move, I'll do a throw
MM
Laying on my back in the guard position would have been fatal to me.
No one who knows BJJ is going to pull guard in a street fight.. They are going to toss him on the ground and then (if needed) kick him in the head.
Also a few of the best things about BJJ are:
1) You practice NOT being taken to the ground by someone that knows how and is resisting your attempts to do the same.
2) if you fall you get right back up and you know how to quickly and efficiently AKA Stand-to-base.
3) You can practice all out if you want to learn leverage, timing etc.
MM
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I don't know if you are not understanding me or if I am not explaining myself.
BJJ is a martial art, just like many other martial arts, most of it's practioners do not train to "street fight or use it in combat"
Training for combat is specialized training.
When I was training it was primarily Aiki ju jitsu, muay tai for empty hand and arnis for weapons training.
I have trained with BJJ practioners and my youngest brother taught ground fighting at a local mma gym for a couple of years, so I do know how they train.
My only point is that combat training is not the same as combat training.