Board Thread:Lore Discussion/@comment-768817-20130817024153/@comment-16047389-20131126224945

The thing though is that while the Septim Line carried the Dragon Blood, they were they were the Emperors because of their lineage from Tiber Septim, not because of the blood of Akatosh. Simply being Dragonborn doesn't qualify someone for the throne, especially not now that there is no reason for it anymore (thanks to Martin Septim being a total boss). That said, if the Dragonborn had been alive during the Oblivion Crisis, Martin Septim been already dead, and it turned out that any Dragonborn could use the Amulet of Kings and not just the bloodline of Saint Alessia, then they MIGHT have had a chance at becoming Emperor. But I am fairly certain that the Amulet of Kings could only be worn and used by those directly from the Alessian bloodline.