BJJ isn't different from JJ stylistically, their backgrounds are different for obvious reasons. There can always be small discrepancies in technique but that differs from trainer to trainer. Judo focuses on throws and the use of the opponents weight or energy rather than submissions.
Why do u think triangle, kimura and armbar are new?
when did I say this?
People are always adding to MMA, its so dynamic and there are so many facets to specialize and coordinate, it never stops changing. asking who has added to technique in MMA recently is like asking who has made a scientific discovery lately.
If i was fighting while injured... it all depends on the injury. paper cut, blinded, broken foot, burnt hands, all of the above?
fighting multiple people, best technique is to run the **** away. if u have to fight, fight and never go to the ground.
same with weapon, why the **** would u fight someone with a weapon? if u have to, and say its common like a knife... id take the advice of my buddy who did 5 years in prison, get your shirt off and wrap it around your forearm to use as a shield so u have something to deflect the knife as you attack him. another guy i worked with had some knifey encounters, he said the same thing. worth a shot