I don’t really appreciate UFC, but the good experience with is that this battles shows to the world of modern martial art to be a little humble about what they pretend they can do. Everything what martial art is about is not what wins a battle. Power, agility, speed, and accuracy are all good features within a warrior, necessary to prevail in combat. But the most important attribute of a good warrior is intelligence in implementation. But most of all, never underestimate a brute force!
Sure speed matters. And sure, speed is useless without power and certain agressivity because fight comes from animals world. Flexibility is not necessarily needed either. It just takes potential killing power and the correct framing of mind. The other evidence and lesson is that there is more than one way to win, but all winning comes back to proficiency.