Okay, bottom line: it all comes down to how you train.
In fact, you don't need to follow any style to be good at fighting (particularly for sport MMA). All you have to do is train your natural weapons and learn how to utilize them.
That's called the art of "fighting".
Here's a suggestion: forget that you're learning a certain style. Just know that you're learning how to fight, and you'll have to train every part of your body, every natural weapon you possess, so that you can do whatever you have to do to survive a fight.
It's really as simple as that.