User blog comment:Sibuna Forever/Season 3 Theory/@comment-3083473-20121004030416

Although what makes me kind of worried about this is that after the new Chosen One/Osirian really realized who they were, the old ones died.

Ex. 1: Nina slowly figured out she was the Chosen One, not Joy, and Sarah died in the same season.

Ex. 2: Eddie did that big Osirian thing in the finale and Rufus died right then.

The same things might have happened to Sarah and Rufus. The previous Chosen One/Osirian before them might have died around the same time they discovered who they were.

Although, HOA is a kids show and it's unlikely for them to make protagonists die, especially someone like Nina, but HOA passed lots of boundaries on Nickelodeon so really anything can happen.