What is the best style to study to become a pro MMA fighter?

What is the best style to study to become a pro MMA fighter?

Bas Rutten (Former UFC Heavyweight Champion) gives expert video advice on: What training should I do to be a pro MMA fighter?; How much should I train to be a pro MMA fighter?; What is the best style to study to become a pro MMA fighter? and more...

Many people ask me and say "what two or what sole martial arts is the best?" There is none anymore. You need to know it all right away. It's very simple, if you go to a jujitsu gym and you train only jujitsu, your opponents will find out real fast. Maybe you'll win one fight or two fights by submission while you take your opponent down but everybody knows and goes "OK, he knows only the ground." From that moment on, if they match you up against a wrestler who can stop your takedown, you're going to be in big trouble, especially if this guy has some boxing skills because he's going to light you up. So right now, in order to do mixed martial arts, you need to do everything at the same time.