The Dragonborn being the reincarnation of Talos would be an interesting twist.
There's speculation that this is how they will retcon the Civil War. Consider this, the image of Tiber Septim was really two people: Hjalti the brilliant tactician and Wulfharth, a storm-shouting Shezarrine Thu'um master. They set out to unite Tamriel under one banner and become known as
Talos (but only as one individual), which means
Stormcrown in Nordic. In
Skyrim, the province of Skyrim or the Empire has to be united, depending on which side you take. Each side has a tactician, one is named
Tullius, the other
Stormcloak. If that was accidental, I'll eat my world.
Suddenly, a wild storm-shouting Thu'um-inator appears!
We don't know if the Dragonborn is a Shezarrine, but you definitely fit the bill for Wulf's role. This is all speculation, but if the devices I listed play out, then you have effectively mantled Talos with whichever leader you've mentioned and united Skyrim--independently or alongside the Empire. I have a feeling that, historically, the side you choose won't matter. History will forget the details, or a Warp in the West-style Dragon Break could occur, however unlikely.