At your age tuff cuff will make you better.
Because you are just about to take the leap to a bigger field need to be strongger to throw the ball. it will condition the body to take the wear and tear the youth players go threw when they go to the big mound.
You will recover quicker and be stronger longer into the season then most of the other pitchers that are lazy and don't train. You will get a jump start on alot of things.