I disagree. Momo nor Shinobu are saying anything to consider Yamato rooting herself, Especially after we know she wants to leave the island... Your saying she's going to 180 on her previous talks, As if meeting Ace and wanting to go ride on a ship out of there mean nothing.
Possibly, because that desire to leave was before Yamato found out Momo and the Akazaya were still alive. It's entirely possible that the connection to Oden's son, something Yamato never had a hope of gaining before, becomes more important to him. At the very least, it will give Yamato's final decision a lot more weight, whether leaving or staying.
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I want Carrot to join, but Yamato's being tied to the Oden side of things does not detract her chances of joining. Jinbe's ties to the plot were more in relation to protecting his people rather than the strawhats. He really only had a big relationship with Luffy prior, just like Yamato. Yamato also has heavy ties to Ace, which we don't know about yet, plus the still continued desire to set sail with Luffy and leave Wano, this has been explicitly stated by the character.
To introduce a major arc related character 50-60% into an arc with no payoff but the arc itself is extremely poor planning on Oda's part otherwise. Shes clearly here to be more than just a Wano character, otherwise she's entirely pointless overall.
Jinbe and Luffy's initial connection was built up over a whole year of interaction, ending with Jinbe saving Luffy's life both physically and mentally. Yamato and Luffy just met, and now Yamato is saving
Momo and Shinobu's lives after finding out they're
still alive. The bond is clearly between those three. Luffy and Yamato's connection to Ace has always felt like an afterthought.
Yamato was clearly created as a red herring to further distract from Carrot. A super strong and cool character who just asks to join Luffy? Of course people are gonna dig that. It's Carrot that's been weaved in with greater care and subtlety. It's Carrot who has the deeper connection with the whole crew.