Actually, as I mentioned earlier, many of their early challenge fights did involve extensive rules negotiations. As the family got more experience in vale tudo fights, the rules got more sparse. Head butting, BTW, was generally allowed in fights which involved striking.
I've got a ton of respect for Royce's accomplishments, but he's nowhere close to the best UFC fighter of all time. The level of competition in Royce's day was nowhere near where it is now.
Yeah, that's a common misconception among certain segments of the BJJ community, but it's not really true. Both BJJ and wrestling require technique. (Speaking as an experienced BJJ practitioner, I am very aware that my wrestling technique sucks and I am currently working to rectify the situation.) Either one can potentially allow a skilled practitioner to defeat a stronger, but less skilled opponent. Both require top notch conditioning to be successful at the higher levels of competition. Look at the top BJJ competitors - they're all physical beasts. Once your opponent knows all the same technique that you do, physical attributes become important.
There are cultural differences in the BJJ and wrestling communities that underlie the stereotype, but I should probably save that discussion for another thread - this one is already getting somewhat off course.
BJJ doesn't beat anything. An individual who knows BJJ might have the potential to beat a wide variety of opponents, depending on the circumstances and the individual's skill and attributes. I've been training BJJ pretty seriously for over 12 years now, and I'm quite aware that there are tons of people out there who have never trained BJJ and are completely capable of kicking my butt.
You might want to re-read Drose427's comment (#29) on the previous page. There's some good advice in the 4th paragraph.
Honestly, at this point you can assume any high level professional MMA fighter is at least somewhat familiar with the fundamentals of BJJ, wrestling, boxing, and Muay Thai, even if their personal foundation is somewhere else.