Board Thread:General Discussion/@comment-10786787-20130613005503/@comment-5417900-20140610175746

I think it works how like how it works in other anime. A transformation equals greater power. Like Goku going Super Saiyan increases his power level. A sword transforming into something new or gaining a new ability increases the reiatsu because it is a new form in a way. That was just my guess; I can be way off.