If I’m understanding you correctly, you’re saying that entering into the belly of the beast – the world of adventure – and then navigating a series of trials and challenges, necessarily entails the integration of their shadow or true nature. Furthermore, the entity that devoured the hero, if there is one, is itself a metaphor for some aspect of the hero’s shadow they have yet to integrate, and must, to see the journey through to a successful conclusion.
Am I in the ballpark?