Lightning reflexes and speed.
Not to mention his decent power.
That is what made RJJ famous, but technically he isn't so great. His natural abilities were so far superior to everyones that it took almost 50 fights to figure him out.
I am a RJJ fan, so I would like to say he would have beaten down Tarver, but being realistic I would have to say that Tarver had his number and exposed Roy weaknesses. Good to see that Roy is working with trainers now, rather than being self trained.
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