How can this be? It is very simple, and I will try to explain without offending anyones nerdy obsessions or unrealistic expectations (not saying that you have any, but I run into them with martial artists in general a lot). The **** that we practice, and I am referring to combat arts, is not rocket science. When it comes down to application, the actual "fighting" part is very simple, and boils down to very few usable techniques, tactics, and strategies. There is no 13th Dan or 15th Dan or ANY credential in any martial art that will make a person impervious to defeat of a fight or sporting contest related to fighting. And the fact is, if you take a couple of athletic guys who have been training in fighting arts and teach them the few things that will work, they can hold themselves up against the best from any art and be a formidable opponent. That is a fact, and that can be a real ***** for some of us who train for years and years; but it is still a fact. We are all human, and what works in fights (or fighting contests) is often very simple. That said, the 13th and 15th Dan are very talented martial artists; and I have no doubts that they probably forget more Budo Taijutsu every day then Bill or Jason will ever learn in their lives. But, that doesn't make them invincible. And for that, it should be expected that talented athletes with some training in the right stuff would make formidable opponents for them. At the end of the day, we are all still human beings.