Is it possible that, all of the Imperial gods are merely interperetations of the other gods from the ancient Nords, the Mer, and other pantheons not yet "illuminated" in canonical lore?
As an extension of that, assuming it is the case, is it possible that the statements naming Alduin as Akatosh and Alduin being the "First Born of Akatosh" are both correct? If all dragons are indeed part of Akatosh, and Alduin was the first dragon, then Alduin would indeed both be the first born of Akatosh AND Akatosh himself.