Board Thread:General Discussion/@comment-10452902-20130708012308/@comment-24433794-20130708013118

No offense, but your example isn't really that great. Mud is simply apart of the Earth element. It's a lot of things that are simply derivatives of bigger elements. Soap-Bubbles is from water, mud is from Earth and many more. Yada Yada Yada. Now, I wasn't here when the rule was decided but I can conclude that it was created because every person in naruto who possess the ability to mold the same elements usually produce the same release. However, you don't have to use each advanced release in the same manner.