These days MMA has become a sport fighting style all it's own, if you havn't noticed most MMA participants don't have a particular style anymore. If you go an mma school you will be taught submissions, kickboxing, and basic bjj. But when it comes down to it no matter what style you practice, a strong base in your style with an understanding of your opponents style can make you a very capable opponent. I personally would like to see more "stylists" challenge the cage, but I doubt that it would really be allowed anymore because of the liability issues that would come up, especially from those who train in the more agressive disciplines. A Ninjutsu practitioner who has a strong understanding of MMA practices could very well make a fine showing in the UFC even as it is today.