I read that everything in an Elder Scrolls is, in some way or another, canon. So technically the Dragonborn ended the Civil War, cured the Companions of LLycanthropy, helped Nocturnal, and assassinated Titus Mede II.
Without Titus Mede II I assume power in the Cyrodiilic Empire has:
A) Fallen to the Elder Council
or
Fallen to Mede's successor
But I don't think Mede has a successor, so technically no one's lit the Dragonfires...
So what's happening with all that, I don't know to much about it.