As someone else mentioned, my impression is that they ignore scaling rules in order to make dumping as many stars into a combo as possible a viable option. He's all about meter management. If you get a good hitconfirm, you can convert stars into damage, but loose your specials after your done. Ignoring proation rules prevents his specials from being less appetizing as the combo goes on, and prevents a situation where "Not going for the extra special" is always a bad idea due to combo length.