Board Thread:Questions and Answers/@comment-88.105.44.40-20140320104229/@comment-24431758-20140320221703

Wave Controllers are given the names of winds and waves. For example: Po Biduh Gustang's sobriquet is the Lonely Wave.

A few examples of Sobriquets being named after something, other than a battle Position:

Enryu's sobriquet is called "Red Tower" because whenever he passes by, the Shinsoo around him turns red for some unknown reason.

Zahard is the first King in the Tower's history and his sobriquet is King of the Tower.

If we go by everything above his sobriquet shoud have something to do with him being capable to copy shinsoo techniques at mere sight (Mimic wave/wind) or if he does something extrodinary his sobriquet can be called after that like if he ends up killing Zahard he might be called King Slayer.