Ok got to admit am a huge lee fan, he got me into martial arts. But, clearly if you take Bruce straight from 1973 and chucked him in the mma ring/octagon he would probly get smashed - taken down and schooled. But think if bruce had been alive he would have loved the whole mma scene, he always talking about no styles, learn everything etc.
Also give him some time (you know if he wasnt dead) - no denying he had incredible speed and natural ability, crazy flexibility and a great work ethic and from the tales of his street fighting fighting days he could take a punch too. Just a thought that had bruce been alive today and had the benefits of the evolution of mma behind him he probly would have done pretty good in mma if he trained in it.
Know this subject been done a few times but still like to put 2 cents in.