Why not Judo vs JiuJitsu?

Ok, we have certainly seen footage of JiuJitsu champions such as royce gracie, fighting in a Judon tournament. However I don't understand why this does not happen regulary, a Brazilian Jiu Jitsu fighter would dominate on ground fight. They have their own tournaments, Abu Dabi being one of the most important... show more Ok, we have certainly seen footage of JiuJitsu champions such as royce gracie, fighting in a Judon tournament. However I don't understand why this does not happen regulary, a Brazilian Jiu Jitsu fighter would dominate on ground fight.
They have their own tournaments, Abu Dabi being one of the most important ones, but why don't these JJ champions go and fight in Judo tournaments, I mean they could come out victorious wouldn't they?.
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