Oh my goodness...Clarity is needed badly here
Martin Septim took the power of Akatosh to defeat Dagon. Martin was NOT Akatosh, he was Martin.
Talos was not an incarnation of Shor or Akatosh. Talos was a man gifted with the soul of a dragon by Akatosh. Dragonborn.
Characters like Wulfharth are Shezzarines, Avatars of Lorkhan or Shezzar. They are capable of bizarre things like Wulfharth being resurrected from ashes after he died at Red Mountain. Talos was not the same. Hjatl was man who ascended to become a god.
We did not play as Pelinal (Ada) in Kotn. We were the CoC who sought the crusaders artifacts to defeat Umaril. Pelinal and Morihaus are Ada, we were not.
Lorkhan has been acting in the world and helping Men to fight Mer for ages.
....now perhaps folks can get their facts straight
Not quite.
Martin Septim mantled Aka and became his avatar, which is the same thing as being Akatosh.
Talos is 8 Shezzarines put together to hold up the world.
Tiber Septim on the other hand was a dragonborn who mantled Shor, making him a Shezzarine. Talos is basically all the Shezzarines combined.
CoC mantled Sheogorath and Pelinal, making him a Daedric Prince and a Shezzarine by proxy.
Lorkhan only fights mer because they're anti-Mundus. But in the long run that still translates to helping men crush the damned elves.
Martin Septim was born with dragonblood, an incanation of Akatosh, so at last with the artifacts COC fetched he could finally become Akatosh, while COC by his deeds played the Lorkhan part-remember Aka and Lorkhan are two sides of one coin? Without another there is no one.
All Aedra gave parts of themselves to the mortal world, they ARE the mortal world. Akatosh is the TIME every single mortal uses to measure the sequence from their birth to death, and Lorkhan is the SPACE every single mortal bears in and departs from. Mortals speak through Kynareth, bond through Mara and attract to each other through Dibella. These are the Aedra. Lorkhan never hated the elves as elves are mortal, and Lorkhan loves his idea of mortal world and all mortals. Shor hated the elves. That is why we say Shor is an aspect of Lorkhan, a nordic-elves-hater aspect of Lorkhan. The same goes to Aka and Auriel, and that is why we can have Akatosh the human lover, a human aspect of Aka ripped most of the Auriel aspects off.
Every mortal is an Aedroth, just as every demora is a Daedroth. The difference between mortal Aedra and immortal Aedra like dragons is that mortals not only bond to TIME but also SPACE, while the Mundus is an idea from SPACE. Less Aka-bond introduces Arkay the circle, while those immortal Aedra has nothing to do with that circle, but these immortal Aedra are also too bonded with TIME that they change whenever a dragonbreak occurs.
Crap, got half ninja'd.
Finally, to make this post even longer. You meet Shor in Sovngarde, but he's to
awesome to be seen by mortal eyes. Alduin is Akatosh; 'nuff said.