You know, one thing I feel people aren't even saying about the whole Carrot/Yamato situation is the pure fact that Carrots powers are not unique to herself. Hell, there's not even an inkling or instance of her having more depth to her powers/strength, unlike virtually all other Strawhats this arc (Which we know at least Zoro, Sanji, Jinbe, and Franky will receive decent powerups by the end of their fights)
Compare that to Yamato. Literally no other female in the series fights like her. She also clearly has a hidden devil fruit. The potential there is just way more interesting than Carrot, who literally also had Wanda perform the exact same feat against Perospero.
And I haven't even talked about just pure strength. Yamato is clearly an upper tier character who would be warranted on a crew nearing the end of their goals and journey. Carrot virtually brings nothing extra to the table in terms of strength. Her power is relegated on one night every month.
I feel like there is virtually no comparison. One is clearly stronger, and has a more unique and interesting powerset, not to mention the potential for what we DON'T know about her powerset.
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I see it likely that at the end of Wano two SHs will join. Yamato is the most obvious candidate, but the second one I think will be unexpected and will be Marco. The fact that Marco has returned to the plot in a saga like Wano makes me suspicious. Why in Wano? Wouldn't it be more logical to reintroduce him when they face Weevil or Teach? After all, Marco's connection to Wano is not very important. Another reason is what will be Marco's future after Wano? I wouldn't be surprised if Luffy asked Marco to be his nakama like he did with Jinbe, without anyone expecting it. If we add to all this that he will possibly have his versus with King (being the only non-SH to face a Calamity or F6), I think he has more chances than many think.
Marco is a doctor, which is redundant to Chopper. His power involves healing people. He's definitely not joining the crew.