Lorkhan appears in the texts as both the one who forced creation into being and the one who paid for it with his heart. That split is not an inconsistency. It is the pattern the games keep returning to when they show what rebellion actually does to the people who start it.
The Monomyth lays out the first side plainly. Lorkhan gathers the et'Ada, argues that they should make a place where their power can change and grow, and convinces enough of them to begin. The act succeeds, but the creators lose strength and many are trapped. The same text notes that the project is remembered as both gift and trap depending on which spirit is speaking.
The 36 Lessons of Vivec push the second side. Sermon 13 and the surrounding accounts treat Lorkhan as the missing witness whose heart still moves under Red Mountain. The Tribunal's own rise repeats the same movement: three people reach for power that was never meant to be held, succeed, and spend the next centuries guarding the evidence of their theft.
Skyrim shows the pattern at smaller scale. The Thu'um originates from draconic power (Akatosh/Alduin lineage) and was taught to mortals by Kyne; no canon source attributes its origin to Lorkhan. Dragonborn power derives from Akatosh's dragon blood/soul, not Lorkhan. Every time the story lets a mortal change the rules, the change leaves someone diminished.
The dual portrayal therefore works as a standing comment on agency. Creation and rebellion are never free. The one who starts the change is also the one most likely to be cut apart by it. That reading fits the sources without needing later additions or out-of-game statements.
What weight do you give Lorkhan's role in the Khajiit and Redguard accounts when you compare them to the Cyrodilic versions? Do the events of Morrowind change how you read the Monomyth?