Sakuraba and Wanderlei both have by consensus earned black belts in the ring. If I have this right, Sakuraba's belt comes partially from defeating Gracies in MMA. I don't question Sakuraba's fighting skill, but I think we all agree that MMA is very different from BJJ. Just look at Nog -- he's a master submission artist, but his game is MMA, not pure BJJ. So my question is: why do people believe that MMA fighting skill (even in the form of submissions) translates to pure BJJ skill? For those higher level belts out there: how high would you rate Sakuraba's or Wanderlei's skills in BJJ rules, just by looking at their fights in MMA?