When we take a look into Elidibus' memories in Anamnesis Anyder, we see him looking at a vision of the original Warrior of Light and stating:

"Sundered though you may be, you fought for the world's salvation. For hope. Hope. It swells within me. Empowers me. Now, now I may carry out my mission."

Based off of this, it makes more sense to me that one of Azem's shards was the original Warrior of Light on Norvrandt. Elidibus just took inspiration from the WoL/Azem and used it to turn himself into that figure, similar to Archbishop Thordan VII turning into King Thordan.