Tav saw something, we saw Sceleritas Fel. But was it really him? Depends on who was telling the story. What I mean is this: what if the fella could work like the Durge's separate personality, manifested to help him cope with the amount of killing and damage done by their own hands. Having a character with a DID could be interesting in terms of the narrative.
Eh, they show the figure Tav saw, I highly doubt there's going to be some convoluted "what Tav saw isn't what we saw" arc when they went out of their way to make an illustration for it. Otherwise you could make that argument for anything. Remember, Dark Urge before the memory loss seemed VERY enthusiastic about their killings, such that they clearly enjoyed it. I doubt there was ever a need to "cope" with it.
