Easy question, what exactly unified these two? What plot/character arc unifies these two relationships to make them one cohesive theme? I hope you have an answer outside of “well there are parent/son so that’s the only thing in common”
Why do you want to unify those two plots ? You should know that thematic milkings are important because they are used to enhance a philosophical thematic in a story. You do not need to unify each bit of plot to make it "one theme".
But actually in that case they are lol.. The unifying link of this arc is Oden. Who act as the catalizers for the notion of "parent". Oden acts as the "parent" that guides Momo, he acts as the "parent" that guides Yamato, he also acts as the "parent" that guides the scabbardbut most of all, he act as the "parent" that guide the revolution ideals and struggle.
This act of parenting doesn't come without weakness as in all those instance, Oden presents some choices that are not ideals. That's why the real theme of Wano is the "inherited will".. The will that is passed on. From Oden to the scabbard, from Oden to Momo, from Oden to Yamato and most of all, from Oden to Luffy. As Luffy will succeed where Oden failed, because he will not make the same mistakes.
Where Oden was relying on himself, Momo, Yamato, the scabbard and Luffy all choosed to rely on others. That's why Yamato made a different choice than the sea at the end of Wano and the complete opposite of his father's wishes, that's why Momo despite his age became a leading figure, that's why the scabbard despite their weaknesses manage to stall Kaido and that's why Luffy defeated a Yonko.
Secondly, why does Kaido call Yamato his son? NOTE: I want Panels with this specific answer. I do not want headcanon explanations for this one.
Their is no need for panel. Yamato is transgender, and Kaido aknowledge that. That's all. If you don't understand that point, you have a problem and a panel will not help you.
Third, the big parallel between Oden and Momo is supposed to be Oden held up the scabbards, Momo holds up Onigashima. But this isn’t happen right? Momo put down Onigashima, he didn’t hold it up. So the parallel is broken.
It's a parallel only in your head mate.
Oh you’re gonna say “no the inheriting on Oden’s Will is through Momo obtaining Oden’s sword”
No, it's through his descision and his choice not to follow his father's wish. (note that both Luffy, Yamato and Momo act in opposition to Oden)
why didn’t Momo earn it then?
He is Oden's fudging son. Why would their need to be a trial for Momo to earn that sword. You ok mate ?
No No No, the big Oden and Momo parallel is NONE OF THE ABOVE (because none of it is well done) it’s Oden dancing for 5 years for his people, and Momo sacrificing 20 years for his peopl to become an adult. Okay. Why did Momo coming to this decision HAPPEN OFFSCREEN? Is this how you consider things “well done”? When big character decisions and changes happen OFFSCREEN? I bet you loved that Yamato changed her mind about joining the crew OFFSCREEN too.
You are really doing paralell like a basic One Piece's fan. Parallel in story are deeper than that. Also no. The change in both Yamato and Momo's descisions was not offscreened. It was both in the panel, it was just so subtle that you didn't noticed it.
In fact if you knew me, you would know that I predicted the change of Yamato's descision the moment Yamato told Luffy that he would join his crew, nothing was a surprise here:
First here
And on the Nakama thread.
Anyway, that’s ONE plot point from your list
And you have debunked nothing. Like I said.. Challenging me to a storytelling fight was not really a wise descision on your part.
It's kind of my expertise mate..