I have a theory that Kingbaum is still alive and that he has a connection to Big Mom's Road Poneglyph.
He did die before.
And was able to come back to life.
His body was still intact after being burned by Prometheus.
Homies can eat other homies to absorb their souls to become stronger.
I think Lady Tree fed Kingbaum some homies to resurrect him. It seems like she is the one who stitched him up the first time.
I think this will be significant because I believe Kingbaum will recover the memories from when he was human. Pudding demonstrated that homies still have the memories of their souls' original owners.
So far the Road Poneglyphs have been located where the Ancient Weapons were.
The only exception has been Zou but it is still connected to Pluton. Zunesha is supposed to open the borders of Wano.
It was revealed that Pluton is buried in Wano under Mt. Fuji. Opening Wano's borders means tearing down its walls to unleash Pluton onto the world.
We know Big Mom took the Road Poneglyph and I think its original location will become important.
That's because Vegapunk believes the Mother Flame was used to power an Ancient Weapon and process of elimination points to Uranus.
Similar to how she gathers ingredients I think Big Mom stole the Road Poneglyph and killed the protector who I believe was Kingbaum. Then I think she used his soul to create a powerful homie to guard her woods.
I think the original location of Uranus and Big Mom's Road Poneglyph is Emerald City. It seems like the name is a nod to The Wonderful Wizard of Oz and Kingbaum's name seems like it's inspired by L. Frank Baum. The story has Fighting Trees in it and it does fit with the Big Mom Pirates fairy tale theme.