‘Tis possible, given that the Natha seem to bend the laws of time and space, and life and death as they see fit.

[ He has died and been brought back to life, after all. The Natha seem to be able to do whatever they want, the natural course of the universe be damned. ]

Who is not to say that of the myriad of universes they keep watch over, there are not those that are identical, save for when the Storm came to call? There may have existed a Hydaelyn that was claimed by the Storm decades, or even centuries, ere the world we know.