The storm titans rarely changed their leader, their king. The title was called the Eye of the Storm. That title, akin to the role of a king, was usually granted to their strongest and wisest. For the eye of a storm is both the calmest point and the source of all of the storm's power.
A storm without its eye would soon dissipate into mist and fall apart, and so the storm titans never spent a year without a leader.
Zeus was the Eye of the Storm, but his son, and Tyal's father, Gale, decided to overthrow his father and take the title. Of course, Zeus was elated, his son finally felt that he was powerful and wise enough to challenge him. He almost threw a party, he could finally retire.
But his son wasn't up to the task. He was still bested by Zeus in both combat and wisdom, he lost spectacularly that even Zeus felt ashamed. But… that was expected. Zeus, not many people reached his power.
