First off, MMA is JKD in motion...but is also a sport. Regardless, the earliest UFC's had no rules, and the evolution of the sport pretty much proves which arts/techniques are most effective in a fight...just like Bruce said, keep and use what's effective and do away with non essential bullshyt. Who's to say that those same MMA fighters wouldn't strike someone in the eyes, throat, or groin in a street fight as well? You're also forgetting that quite a few MMA fighters have trained in traditional martial arts along with those conventional for the cage. If a young Bruce Lee were alive today, he'd be involved in MMA wholeheartedly training his ass off along with most likely dominating his weight class. Anderson Silva, for example, is pretty much the closest person we have to Bruce Lee today.
Secondly, you speak of Tank and Brock as if they've both never been beaten. As the sport evolved, of course they were exposed and weeded out. You also fail to realize that both Tank and Brock usually won against those who stylistically they had an advantage against, especially Tank being that he was the UFC's earliest days when it was still no rules and style vs. style...by your logic many so-called TMA practicioners/masters could have, and should have entered and dominated considering that anything went. However, at the same time, you underestimate the both of them because Tank, first off, was a freak of nature as far as his strength and punching power(regardless of his appearance, the man could bench 600 lbs and hit like a freight train so of course most people he landed those haymakers on were going to sleep), and so was Lesnar who is a well accomplished amateur wrestler along with being an exceptionally gifted athlete. If Lesnar entered MMA in his younger days and got over his fear of being hit, he would have dominated the heavyweight division for quite some time.
In simpler terms, I'll post a quote out of the mouth of Bruce Lee himself.... "Someone with only a year of training in boxing and wrestling could easily defeat a martial artist of twenty years experience." The man was a fighting genius and was ahead of his time. His philosophies basically forefathered MMA as we know it. Regardless of rules/no rules, as I said, anyone can strike to the eyes/throat/groin/whatever, it doesn't take decades of some mystical art to pull that shyt off...the fact of the matter is that MMA is the closest thing to a street fight in athletic competition, and it proves which techniques out of what styles would be the most effective in fights anywhere. If Bruce Lee were alive today, he'd agree.
