The file supposedly has to stay the same size. So if you reduce the size of someone's fighting style by a certain amount of characters you'll have to add that amount somewhere else. That's how it has worked for me. However, if you mess around with it, you'll notice that you can change something without changing something else as long as you keep the dots separating different sections at a maximum of 4 dots and a minimum of 1 (they're not normal dots though, if you look at their numerical value you'll notice it's 00).