What if you weren't saved by Louisoix and instead the big crystal saved you but struck everything about you from existence and remembrance? Because you were a warrior who's time hadn't come yet? So instead of perishing on the battlefield you were then reborn back into the world 5 years later and decided to head back to your home city state?(Answer I've been here before)
Yet since the Crystal feared the possibility of alerting enemies of the world (Imperials, Primals, Beast clans) it had to wipe your existence. However since it wasn't Louisoix's spell that was cast upon you, you weren't returned to where everyone else was but instead had to make the journey back to your city-state of choice alone.
I mean, upon that battlefield there had to be a ton of missing soldiers among the many dead right?