Board Thread:Lore Discussion/@comment-24267938-20130323172448/@comment-182.253.33.175-20140815043312

Titus Mede I and many of those who conquered Imperial city are Colovian warlords, and Colovia itself is not bigger than Skyrim. Also Tiber Septim is a Nord who at first don't have the whole Skyrim manpower, let alone the whole Tamriel. Tiber Septim didn't conquer Tamriel using massive army from the start, and he did conquered every regions one by one.

So no, by conquering Imperial city alone won't make the last Dragonborn become an emperor of Tamriel. Not to mention, during the time of Skyrim, big part of Tamriel is totally under Aldmeri Dominion grasp, excluding Skyrim and Hammerfell. That makes it that the new emperor could come from either Aldmeri, Skyrim, or Hammerfell.

That to say, it's not impossible and not unlikely for the last Dragonborn to follow Tiber Septim's path. He/she is a Thane after all, and does have starting manpower considering some if not all Jarls loyalties he/she got on Skyrim storyline.

As for what's canonized, Bethesda do have some means to make all of the conflicting questlines and choices canonized and happens. For one, Dragon Break...for two, Hero of Kvatch as the new Mad God (yes, i highly believe that's him we met at Skyrim, since he claim of all that the hero did at Oblivion, assuming he's not lying of course). Canonizing one gender also isn't impossible for a game, and it's as possible as keeping the gender in the canon ambiguous.