Knowledge - of what exactly? I'm pretty sure those 11 year old black belts are very knowledgable.
Skill - Hardly, I've seen some BB that lacked skill, maybe they didn't try hard enough or weren't trained properly.
Experience - They have to go through it so they gain the experience to become a BB.
Fighting Ability - No, some people just aren't born to fight and will always suck even if they are black belts.
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