Board Thread:Theories and Rumors/@comment-27274909-20151128130358/@comment-27507964-20160103005215

It also adds complexity when you look back at the second episode of season 5 (I can't remember the name) and Morro uses lighting. Either two elemental master's family trees are very closely connected or lighting and wind are two sides of the same element. One child of the first weather master got lighting and the other got wind. The elements are still connected and can be accessed through true potential or great emotion, but are separate in most parts.