I think that seeing as how Yamato doesn't have her own identity and doesn't have greater purpose to go with Luffy right now, I don't doubt Yamato is being put in Wano as a sort of test to see how content she is in trying to be like Oden in Wano while Luffy and the others are having fun elsewhere, and have her think about things over again that will finally lead to her traveling with the crew, as herself, which Momo may be the catalyst for since they're both interested in lore like Joy Boy.
I get the feeling the next arc will give her enough time for her choice of being Oden in Wano to really sink in and deal with any insecurities she has, revealing what she really takes pride in beyond being Oden. Yamato didn't really have a "Shanks" in her life either, since it seems that she never met with Oden despite admiring him. So Momo might be built up to be the "Shanks" in Yamato's life, one she can share a dream/common interest with, which might be opening Wano's borders like Oden wanted, and be the catalyst which finally encourages Yamato to sail out with greater purpose and find the answers they seek about the borders and maybe Pluton, justifying going to Laugh Tale with Luffy.
I get the feeling the next arc will give her enough time for her choice of being Oden in Wano to really sink in and deal with any insecurities she has, revealing what she really takes pride in beyond being Oden. Yamato didn't really have a "Shanks" in her life either, since it seems that she never met with Oden despite admiring him. So Momo might be built up to be the "Shanks" in Yamato's life, one she can share a dream/common interest with, which might be opening Wano's borders like Oden wanted, and be the catalyst which finally encourages Yamato to sail out with greater purpose and find the answers they seek about the borders and maybe Pluton, justifying going to Laugh Tale with Luffy.
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