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size and weight is always a factor in relation to fighting , very reason why there is weight divisions.
Having said that someone with several years of BJJ would stand a better chance in your scenario than someone without it.
Also there would be BJJ blackbelts that could could be smaller and yet choke out someone much bigger too.
When your talking about African American /Latino crackhead streetthugs -gangbangers then its usually knives and guns already , America is Gunsville, self defense in USA = you need not just Blackbelt in BJJ but a Glock too.
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