It´s very important to know some level of various martial arts. But this ideia of mixing in all kinds of martial arts to your game is like learning a second language: you´ll never be as good in the other languages as you are in your original one. So you have to focus primarily on your speciality to be able to have a big advantage over your opponent, like Wonderboy and Maia, two specialists in their areas who have been imposing their game very effectively. I agree with JDS, that should be his main focus, he looked fantastic early on. By the way, that Overeem fight stoppage was bull.