Headcanon: Scott and Acho Denholm and their family's descendants, Nominal and Katie.
Scott watching Katie and seeing what Acho had explained to him so many times and he'd tried to understand but only now could fully comprehend--that someone could leave their family, their home, and find a new one elsewhere and for it to be just as important.
Acho watching Nom and seeing, from a perspective it had been impossible to see from when he'd been in Katie's shoes, the sacrifices that his older brother made in a slightly different font. Seeing how Nom threw himself and gave everything to be as strong as he is for Katie's sake, and that being the favorite child isn't exclusive to wanting to give your sibling the world.
Scott and Acho watching Katie run away like Acho did, seeking her own life and identity.
Scott and Acho watching Nom break, thinking Katie was dead only to see her with the other side. The divide between the Red and Blue far greater than the divide between the Herons and Nightingales ever had been.
Scott and Acho watching Nom and Katie reconcile and reconnect, and grinning at each other while recalling their own experiences doing the same.
Scott and Acho watching Nom take the deal with the Creaking King and Acho immediately being angry but Scott seeing the underneath. Acho arguing he can't know what Nom was thinking, even with experience because Scott never did something that stupid. Scott countering that he had tried, and he knew exactly what was going through his own head. The only difference is that Acho shoved Scott out of the way and Katie didn't even know Nom was offered the deal.
Scott and Acho watching Katie be forced to make horrible decisions and Acho having to explain to Scott that sometimes strangers really can become just as important as your family, and Scott struggling to understand that.
Acho watching Katie stare at her final chance to save Nom and seeing her choose no. Wondering what made them different.
Scott watching Nom continue to fight the Creaking King and Sausage, knowing he would die in the end, and despite being sad that his great-something grandchild was going to die, being glad that Nom wouldn't have to live with the wrenching pain that was being the cause of his little sibling's death. The one person he gave everything for, dead because of his actions.
Nom dying and while watching everyone, meeting other people in the afterlife, including Sausage who he punched for Martyn and reluctantly offered a hug for Cam, meeting Scott and Acho.
Nom learning that the reason he always wanted to sail because he was the scion of a family of great pirates, that the ocean was in his blood. Getting chewed out by his ancestors who scolded each other as much they did him, because everything he did, so did one of them. Sacrificing too much, sacrificing himself, giving his all for his family and finally choosing to be selfish lest he kill himself bleeding for them.
Katie eventually dying and after many reunions, she meets them too, along with many others.
Their family tree had many branches. In fact, one branch married into an elven family, and they met the product of that. Nom and Katie discovering only in death that Scott Springwell was their very (x10) distant cousin.
