Can't any number of interpretations of Lorkhan simultaneously exist all at once; Shor, Shezarr, Sheor and Sep ?
Of course.
Remember that the Aedra, even Lorkhan and Akatosh, are not single entities capable of action, they are fragments of being spread out over a multitude of mortals. Thus, Lorkhan is what mortals think he is, because what they think he makes him that. Alduin is Akatosh, but then so is the Dragonborn. They are both fragments of the being Akatosh which does not exist except in the lesser beings it split itself into at the start of the world.
Alduin is a fragment of Akatosh is a fragment of Anuiel is a fragment of Anu is a fragment of Everything. In this way, All Alduins are Akatoshs, but all Akatoshs are not Alduins.