How many of you have Fight Night Round 2?

Is there a way to max out your boxers Power attribute, but still have him as thin as a concentration camp prisoner? Or is the Power rating directly connected to the Muscle buffness of the boxer?

I' m trying to make max out my boxers power rating, (coz i' m using Pacquiao), but everytime i train with any of the power regimens, his muscles immediately increase, and he starts looking more like a heavyweight.