The thing is, an origin story is all about what drives a character.
Why are they here? Why do they do what they do? Who do they love? Why do they love them? What would they do to keep that person safe? If that person dies? What do they fear the most? What makes them take notice in their life? What do they miss that they shouldn’t have? Who did they lose? What drives them?
It is inevitable that any story that tries to match up to the exquisite agony of experiencing a character becoming will be less emotionally ‘true’ than whatever follows unless the characters can be made to reach that same level of emotional epiphany within following the work.
— the reason we all dislike sequels even if we were frothingly in love with the original.