What if the dovahkiin is the manifistation of the will of Talos on Nirn, maybe even the reincarnation of Tiber septim.

In life Tiber helped fight the breton/nord alliance / Dovahkiin helped fight the Thalmor a alliance between elven races

Tiber learned the way of the voice from a long forgoten dead nordic king/ Dovahkiin learned the way of the voice from a long forgoten dragon who was a general

They are both dragon born and learned from the greybeards, when the greybeards spoke Tibers name the world shook, when they say Dovahkiins name the world shakes

Tiber was known to do some shady things, he betrays his own ally kills him and slits his own throat to take the blame of himself/ Dovahkiin depending on who is playing is a theif and an assisan

Talos rises to the heavans/ Dovakiin rises to the nordic heavans

There is a big corrilation between the nerevarine as well, and the hero of kvatch

Tiber defeats the tribunal/ the Nerevarine ends the Tribunals power which leads to their defeat

The hero of Kvatch goes to oblivion and becomes a Daedric prince/ Tiber becomes a god

The main charecters at least in 3,4,5 all kind of repeat Talos's exploits just in a toned down fashsion